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2.25% Convertible Senior Notes Due 2019 (Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
2.25% Convertible Senior Notes Due 2019 [Abstract]    
Contractual coupon interest expense $ 1,856 $ 1,856
Amortization of debt discount 2,248 2,128
Amortization of debt issuance costs 327 299
Total interest expense related to Notes $ 4,431 $ 4,283