Debt Obligations Debt Obligations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Dec. 31, 2011	Jul. 25, 2011
Debt Obligations [Abstract]
Convertible Debt	$ 60,000	$ 60,000	$ 60,000
Debt Instrument, Unamortized Discount	(12,871)	(13,476)
Long-term Debt	47,129	46,524
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Convertible, Remaining Discount Amortization Period	12,871,000
Debt Instrument, Interest Rate, Stated Percentage			3.75%
Debt Instrument, Convertible, Conversion Price			$ 12.95
Proceeds from Convertible debt, convertible note hedge and warrant	$ 50,249

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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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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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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