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Debt (Details Textual) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Oct. 31, 2011
3.25% Convertible Notes due 2011 [Member]
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Oct. 31, 2004
3.25% Convertible Notes due 2011 [Member]
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Dec. 31, 2011
3.25% Convertible Notes due 2011 [Member]
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Dec. 31, 2010
3.25% Convertible Notes due 2011 [Member]
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Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
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Dec. 31, 2011
8.75% Senior Notes due 2015 [Member]
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Dec. 31, 2010
8.75% Senior Notes due 2015 [Member]
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Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
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Dec. 31, 2011
9.75% Senior Secured Notes due 2015 [Member]
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Dec. 31, 2010
9.75% Senior Secured Notes due 2015 [Member]
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Jan. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
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Oct. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
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Jun. 30, 2009
11.25% Senior Secured Notes due 2013 [Member]
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Dec. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
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Dec. 31, 2010
11.25% Senior Secured Notes due 2013 [Member]
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Jul. 31, 2008
13% Senior Notes due 2013 [Member]
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Dec. 31, 2011
13% Senior Notes due 2013 [Member]
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Dec. 31, 2010
13% Senior Notes due 2013 [Member]
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Aug. 31, 2008
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Dec. 31, 2011
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Dec. 31, 2010
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Oct. 31, 2010
7.625% Senior Notes due 2018 [Member]
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Dec. 31, 2011
7.625% Senior Notes due 2018 [Member]
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Dec. 31, 2010
7.625% Senior Notes due 2018 [Member]
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| Debt (Textual) [Abstract] | |||||||||||||||||||||||||||
| Aggregate principal amount issued | $ 230,000,000 | $ 800,000,000 | $ 257,000,000 | $ 525,750,000 | $ 778,500,000 | $ 550,000,000 | $ 700,000,000 | ||||||||||||||||||||
| Interest rate on instrument | 3.25% | 8.75% | 8.75% | 9.75% | 9.75% | 11.25% | 13.00% | 13.00% | 7.00% | 7.00% | 7.625% | 7.625% | |||||||||||||||
| Number of Shares for each $1000 principal amount on conversion | 188.6792 | 533.3333 | |||||||||||||||||||||||||
| Conversion price per share | $ 5.30 | $ 5.30 | $ 1.875 | $ 1.875 | |||||||||||||||||||||||
| Debt instrument convertible principal amount | 1,000 | 1,000 | |||||||||||||||||||||||||
| Maturity date of notes | Oct. 15, 2011 | Apr. 01, 2015 | Sep. 01, 2015 | Aug. 01, 2013 | Dec. 01, 2014 | Nov. 01, 2018 | |||||||||||||||||||||
| Due date of interest on note | semi-annually on April 15 and October 15 | semi-annually in arrears on April 1 and October 1 of each year | semi-annually in arrears on March 1 and September 1 of each year | semi-annually in arrears on February 1 and August 1 of each year | semi-annually in arrears on June 1 and December 1 of each year | semi-annually in arrears on May 1 and November 1 of each year | |||||||||||||||||||||
| Outstanding notes purchased | 234,976,000 | 1,262,396,000 | 755,447,000 | 40,376,000 | 567,927,000 | ||||||||||||||||||||||
| Principal balance repaid | 23,866,000 | 168,113,000 | 36,685,000 | 489,065,000 | |||||||||||||||||||||||
| Minimum purchase price for 3.25% Notes in 2011 | 100.75% | ||||||||||||||||||||||||||
| Maximum purchase price for 3.25% Notes in 2011 | 101.00% | ||||||||||||||||||||||||||
| Aggregate loss on extinguishment of notes | (7,206,000) | (120,120,000) | (267,646,000) | 2,291,000 | 4,915,000 | 85,216,000 | |||||||||||||||||||||
| Proceeds from issuance of debt | 1,274,707,000 | 582,612,000 | 786,000,000 | 244,292,000 | 488,398,000 | ||||||||||||||||||||||
| Debt discount | $ 0 | $ 515,000 | $ 14,000,000 | $ 9,753,000 | $ 12,213,000 | $ 12,708,000 | $ 8,356,000 | $ 10,116,000 | $ 37,352,000 | $ 0 | $ 1,705,000 | $ 39,504,000 | $ 59,592,000 | $ 5,956,000 | $ 7,620,000 | $ 10,898,000 | $ 12,054,000 | ||||||||||
| Maximum Consolidated leverage Ratio after the incurrence of the indebtedness to incur additional indebtedness | 6.00 to 1.00 | ||||||||||||||||||||||||||
| Maximum Leverage Ratio after the incurrence of the indebtedness to incur additional indebtedness | 1.00 | ||||||||||||||||||||||||||
| Minimum Leverage Ratio after the incurrence of the indebtedness to incur additional indebtedness | 6.00 | ||||||||||||||||||||||||||