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Debt and Commitments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Net carrying value of liability component	$ 346,052	$ 357,718
Debt instrument, convertible, remaining discount amortization period	27
Convertible Debt [Member] \| 3.75% Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying value of equity component, net of tax	0	11,731
Convertible notes	0	92,500
Unamortized debt discount	0	(114)
Net carrying value of liability component	0	92,386
Convertible Debt [Member] \| 3.375% Convertible Notes [Member]
Debt Instrument [Line Items]
Carrying value of equity component, net of tax	10,772	10,772
Convertible notes	55,636	55,636
Unamortized debt discount	(5,333)	(7,377)
Net carrying value of liability component	$ 50,303	$ 48,259
Debt instrument, convertible, effective interest rate	8.00%

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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