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Debt (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2010
8.75% Senior Notes due 2015 [Member]
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Mar. 31, 2013
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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Mar. 31, 2013
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Mar. 01, 2013
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Jan. 31, 2013
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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Mar. 31, 2013
7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Dec. 31, 2012
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, 2013
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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Aug. 31, 2012
5.25% Senior Notes due 2022 [Member]
|
Mar. 31, 2013
5.25% Senior Notes due 2022 [Member]
|
Dec. 31, 2012
5.25% Senior Notes due 2022 [Member]
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Apr. 30, 2012
9.75% Senior Secured Notes due 2015 [Member]
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Mar. 31, 2012
9.75% Senior Secured Notes due 2015 [Member]
|
Mar. 31, 2012
9.75% Senior Secured Notes due 2015 [Member]
|
Aug. 31, 2009
9.75% Senior Secured Notes due 2015 [Member]
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Mar. 31, 2012
13% Senior Notes due 2013 [Member]
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Mar. 31, 2012
13% Senior Notes due 2013 [Member]
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Jul. 31, 2008
13% Senior Notes due 2013 [Member]
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Dec. 31, 2012
Senior Secured Revolving Credit Facility [Member]
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Mar. 31, 2013
Common Stock [Member]
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| Debt (Textual) [Abstract] | ||||||||||||||||||||||||||
| Interest rate on instrument | 8.75% | 7.00% | 7.625% | 5.25% | 9.75% | 13.00% | ||||||||||||||||||||
| Aggregate principal amount issued | $ 800,000 | $ 550,000 | $ 700,000 | $ 400,000 | ||||||||||||||||||||||
| 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 | Nov. 01, 2018 | Aug. 15, 2022 | ||||||||||||||||||||||
| Issued value of debt | 786,000 | |||||||||||||||||||||||||
| Debt discount | 14,000 | 6,342 | 7,056 | 3,307 | 3,307 | 4,112 | 9,319 | 9,647 | 5,710 | 5,826 | ||||||||||||||||
| Number of shares for each $1000 principal amount on conversion (in shares) | 543.1372 | 581.3112 | 543.1372 | |||||||||||||||||||||||
| Conversion price per share (in dollars per share) | $ 1.841 | $ 1.841 | ||||||||||||||||||||||||
| Principal amount of the Exchangable Notes converted | 47,630 | |||||||||||||||||||||||||
| Amount of Exchangable Notes converted (in shares) | 27,687,850 | |||||||||||||||||||||||||
| Amortized discount and deferred financing fees | 2,533 | |||||||||||||||||||||||||
| Debt instrument, term | 5 years | |||||||||||||||||||||||||
| Credit facility, maximum borrowing capacity | 1,250,000 | |||||||||||||||||||||||||
| Credit facility, unused capacity, commitment fee percentage | 0.30% | |||||||||||||||||||||||||
| Principal balance repurchased | 9,500 | 32,572 | 34,254 | |||||||||||||||||||||||
| Repurchase price of long-term debt | 1,933 | 58,338 | 35,565 | 39,610 | ||||||||||||||||||||||
| Aggregate loss on extinguishment of notes | $ 0 | $ (9,971) | $ (3,778) | $ (6,193) | ||||||||||||||||||||||
| Maximum consolidated leverage | 5.0 | |||||||||||||||||||||||||