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Debt (Details Textual) (USD $)
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12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | ||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
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Dec. 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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Dec. 31, 2012
7% Exchangeable Senior Subordinated Notes due 2014 [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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Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
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Dec. 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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Dec. 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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Oct. 31, 2010
7.625% Senior Notes due 2018 [Member]
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Dec. 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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Aug. 31, 2012
5.25% Senior Notes due 2022 [Member]
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Dec. 31, 2012
5.25% Senior Notes due 2022 [Member]
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Dec. 31, 2011
5.25% Senior Notes due 2022 [Member]
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Feb. 28, 2011
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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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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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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Dec. 31, 2012
Senior Secured Revolving Credit Facility [Member]
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| Debt (Textual) [Abstract] | ||||||||||||||||||||||||||||
| Interest rate on instrument | 8.75% | 7.00% | 9.75% | 13.00% | 7.625% | 5.25% | 3.25% | 11.25% | ||||||||||||||||||||
| Aggregate principal amount issued | $ 800,000,000 | $ 550,000,000 | $ 257,000,000 | $ 778,500,000 | $ 700,000,000 | $ 400,000,000 | ||||||||||||||||||||||
| Due date of interest on note | semi-annually in arrears on April 1 and October 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 | semi-annually in arrears on February 15 and August 15 of each year | ||||||||||||||||||||||||
| Maturity date of notes | Apr. 01, 2015 | Dec. 01, 2014 | Sep. 01, 2015 | Aug. 01, 2013 | Nov. 01, 2018 | Aug. 15, 2022 | ||||||||||||||||||||||
| Proceeds from issuance of debt | 383,641,000 | 0 | 1,274,707,000 | 786,000,000 | 244,292,000 | |||||||||||||||||||||||
| Debt discount | 14,000,000 | 7,056,000 | 9,753,000 | 4,112,000 | 5,956,000 | 12,708,000 | 0 | 8,356,000 | 0 | 39,504,000 | 9,647,000 | 10,898,000 | 5,826,000 | 0 | ||||||||||||||
| Number of shares for each $1000 principal amount on conversion (in shares) | 543.1372 | 533.3333 | ||||||||||||||||||||||||||
| Debt instrument convertible principal amount | 1,000 | |||||||||||||||||||||||||||
| Conversion price per share (in dollars per share) | $ 1.841 | $ 1.875 | ||||||||||||||||||||||||||
| Debt instrument, term | 5 years | |||||||||||||||||||||||||||
| Credit facility, maximum borrowing capacity | 1,250,000,000 | |||||||||||||||||||||||||||
| Credit facility, unused capacity, commitment fee percentage | 0.30% | |||||||||||||||||||||||||||
| Maximum consolidated leverage | 5.0 | |||||||||||||||||||||||||||
| Principal balance repaid | 257,000,000 | 778,500,000 | 168,113,000 | 36,685,000 | 489,065,000 | |||||||||||||||||||||||
| Outstanding notes purchased | 915,824,000 | 234,976,000 | 1,262,396,000 | 281,698,000 | 879,133,000 | 40,376,000 | 567,927,000 | |||||||||||||||||||||
| 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 | $ (132,726,000) | $ (7,206,000) | $ (120,120,000) | $ (22,184,000) | $ (110,542,000) | $ (2,291,000) | $ (4,915,000) | $ 85,216,000 | ||||||||||||||||||||