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2.25% Convertible Senior Notes Due 2019 (Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount) (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
2.25% Convertible Senior Notes Due 2019 [Abstract]    
Contractual coupon interest expense $ 1,857 $ 3,713
Amortization of debt discount 2,128 4,256
Amortization of debt issuance costs 294 593
Total interest expense related to Notes $ 4,279 $ 8,562