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Debt (Details Textual) (USD $)
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3 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | ||||||||||||||
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Mar. 31, 2012
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Mar. 31, 2011
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Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
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Mar. 31, 2012
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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Mar. 31, 2012
9.75% Senior Secured Notes due 2015 [Member]
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Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
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Mar. 31, 2012
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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Jul. 31, 2008
13% Senior Notes due 2013 [Member]
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Mar. 31, 2012
13% Senior Notes due 2013 [Member]
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Dec. 31, 2011
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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Mar. 31, 2012
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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Oct. 31, 2010
7.625% Senior Notes due 2018 [Member]
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Mar. 31, 2012
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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Mar. 31, 2012
3.25% Convertible Notes due 2011 [Member]
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Mar. 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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Jan. 31, 2011
11.25% Senior Secured Notes due 2013 [Member]
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Mar. 31, 2011
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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Apr. 30, 2012
Repayment of Debt [Member]
9.75% Senior Secured Notes due 2015 [Member]
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Apr. 30, 2012
Repayment of Debt [Member]
13% Senior Notes due 2013 [Member]
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| Debt (Textual) [Abstract] | ||||||||||||||||||||||||||
| Aggregate principal amount issued | $ 800,000,000 | $ 257,000,000 | $ 778,500,000 | $ 550,000,000 | $ 700,000,000 | |||||||||||||||||||||
| Interest rate on instrument | 8.75% | 9.75% | 13.00% | 7.00% | 7.625% | 3.25% | 11.25% | |||||||||||||||||||
| Due date of interest on note | 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 | |||||||||||||||||||||
| Maturity date of notes | Apr. 01, 2015 | Sep. 01, 2015 | Aug. 01, 2013 | Dec. 01, 2014 | Nov. 01, 2018 | |||||||||||||||||||||
| Proceeds from issuance of debt | 786,000,000 | 244,292,000 | ||||||||||||||||||||||||
| Debt discount | 14,000,000 | 9,102,000 | 9,753,000 | 6,886,000 | 12,708,000 | 6,886,000 | 8,356,000 | 32,438,000 | 39,504,000 | 5,513,000 | 5,956,000 | 10,595,000 | 10,898,000 | |||||||||||||
| Principal balance repaid | 32,572,000 | 34,254,000 | 94,148,000 | 9,500,000 | 62,729,000 | |||||||||||||||||||||
| Principal balance repaid inclusive of accrued interest | 58,338,000 | 133,100,000 | 35,565,000 | 39,610,000 | 40,376,000 | 73,616,000 | ||||||||||||||||||||
| Aggregate loss on extinguishment of notes | 9,971,000 | 5,994,000 | 3,778,000 | 6,193,000 | 1,079,000 | 4,915,000 | 11,600,000 | |||||||||||||||||||
| Number of Shares for each $1000 principal amount on conversion (in shares) | 533.3333 | |||||||||||||||||||||||||
| Debt instrument convertible principal amount | $ 1,000 | |||||||||||||||||||||||||
| Conversion price per share (in dollars per share) | $ 1.875 | $ 1.875 | ||||||||||||||||||||||||
| Minimum purchase price for 3.25% Notes in 2011 | 100.75% | |||||||||||||||||||||||||
| Maximum purchase price for 3.25% Notes in 2011 | 100.94% | |||||||||||||||||||||||||
| Maximum consolidated leverage | 6.0 | |||||||||||||||||||||||||