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Long-Term Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Liability and equity components related to the Convertible Notes
Carrying amount of the equity component	$ 36,936	$ 36,936
Unamortized debt discount		1,718
Net carrying amount of the liability component	850,191	776,055
3.5% senior subordinated convertible notes due 2026 [Member]
Liability and equity components related to the Convertible Notes
Principal amount of the liability component	63,324	150,602
Net carrying amount of the liability component	$ 63,324	$ 148,884

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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