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Summary of Quarterly Financial Data (Unaudited) (Details Textual) (USD $)
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3 Months Ended | 12 Months Ended | ||||
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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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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| Quarterly Financial Information (Textual) [Abstract] | ||||||
| Lease adjustment and other charges | $ 6,800,000 | |||||
| Loss on extinguishment of debt | 17,100,000 | 2,600,000 | (19,713,000) | (1,107,000) | (7,665,000) | |
| Interest on notes | 5.00% | 5.00% | 5.00% | |||
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5.0 % Convertible Notes and 7.0% Senior Subordinated Notes due 2022 [Member]
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| Quarterly Financial Information (Textual) [Abstract] | ||||||
| Incremental interest incurred charge | $ 1,200,000 | |||||
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5.0 % Convertible Notes [Member]
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| Quarterly Financial Information (Textual) [Abstract] | ||||||
| Interest on notes | 5.00% | |||||
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7.0% Notes [Member]
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| Quarterly Financial Information (Textual) [Abstract] | ||||||
| Interest on notes | 7.00% | |||||
| X | ||||||||||
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- Definition
Lease adjustment and other charges. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Increase for accrued, but unpaid interest on the debt instrument for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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