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Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Carrying value and estimated fair value of debt
Carrying value of debt	$ 269,822	$ 274,698
Credit Agreement Debt \| Carrying Value
Carrying value and estimated fair value of debt
Carrying value of debt	142,500	150,000
Credit Agreement Debt \| Fair Value
Carrying value and estimated fair value of debt
Debt Instrument, Fair value	150,468	162,881
Convertible Debt \| Carrying Value
Carrying value and estimated fair value of debt
Carrying Value	150,000	150,000
Convertible Debt \| Fair Value
Carrying value and estimated fair value of debt
Debt Instrument, Fair value	$ 166,932	$ 158,400

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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