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Long-Term Debt (Details 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of the effect on financial statement balances due to extinguishment of 5.0 % Convertible Notes |  |  |  |  |
Cash (cash paid to repurchase 5.0% Convertible Notes) |  |  | $ 164,896 | $ 64,576 | $ 249,190
Paid-in capital (stock issuance of 4.1 million shares at $16.6554 per share) |  |  | 67,536 |  |
Paid-in capital (conversion option tax effect) |  |  | 662 | 627 |
Loss on debt extinguishment (allocated expenses) | 17,100 | 2,600 | (19,713) | (1,107) | (7,665)
Paid-In Capital [Member] |  |  |  |  |
Summary of the effect on financial statement balances due to extinguishment of 5.0 % Convertible Notes |  |  |  |  |
Paid-in capital (stock issuance of 4.1 million shares at $16.6554 per share) |  |  | 67,495 |  |
Paid-in capital (conversion option tax effect) |  |  | 662 | 627 |
5.0% Convertible Senior Notes [Member] |  |  |  |  |
Summary of the effect on financial statement balances due to extinguishment of 5.0 % Convertible Notes |  |  |  |  |
5.0% Convertible Notes (write-off of principal) |  |  | 155,050 |  |
Other assets (write-off of unamortized debt discount and deferred loan costs) | (16,797) |  | (16,797) |  |
Cash (cash paid to repurchase 5.0% Convertible Notes) |  |  | (164,896) |  |
Loss on debt extinguishment (fair value less carrying value) |  |  | 18,473 |  |
Deferred income tax liability |  |  | (662) |  |
Loss on debt extinguishment (allocated expenses) |  |  | 1,240 |  |
Cash (allocated expenses related to debt extinguishment) |  |  | (1,240) |  |
Cash (allocated expenses related to stock issuance) |  |  | (333) |  |
5.0% Convertible Senior Notes [Member] | Paid-In Capital [Member] |  |  |  |  |
Summary of the effect on financial statement balances due to extinguishment of 5.0 % Convertible Notes |  |  |  |  |
Paid-in capital (stock issuance of 4.1 million shares at $16.6554 per share) |  |  | (67,869) |  |
Paid-in capital (conversion option) |  |  | 76,039 |  |
Paid-in capital (conversion option tax effect) |  |  | 662 |  |
Paid-in capital (allocated expenses related to stock issuance) |  |  | $ 333 |  |

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