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Debt and Commitments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Apr. 05, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member]	Dec. 31, 2012 Convertible Debt [Member] 3.375% Convertible Notes [Member]	Dec. 31, 2011 Convertible Debt [Member] 3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying value of equity component, net of tax				$ 10,772	$ 10,772
Principal value of liability component			92,500	55,636	55,636
Unamortized debt discount				(3,122)	(5,333)
Net carrying value of liability component	$ 646,613	$ 346,052		$ 52,514	$ 50,303

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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.

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- Definition

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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