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Fair Value of Financial Instruments (Details 2) (5% Convertible Senior Notes due 2014, USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
5% Convertible Senior Notes due 2014 |  |  |
Debt |  |  |
Face Value | $ 172,500 | $ 172,500 |
Carrying Value | 151,487 | 147,556 |
Fair Value | $ 175,519 | $ 172,716 |
Convertible notes stated interest rate (as a percent) | 5.00% | 5.00% | 5.00%

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