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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components) (Details) - 2.25% Convertible Senior Notes Due 2019 [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2014
Debt Instrument [Line Items]      
Amount of the equity component [1] $ 45,808 $ 45,808  
2.25% convertible senior notes due 2019 330,000 330,000 $ 330,000
Unamortized debt discount [2] (31,966) (34,214)  
Unamortized transaction costs related to the debt component (4,982) (5,309)  
Contractual coupon interest accrual 1,856 7,425  
Contractual coupon interest payment   (7,425)  
Net carrying amount $ 294,908 $ 290,477  
[1] Net of $1,177 thousands of transaction costs related to the equity component of the Notes.
[2] As of March 31, 2016, the remaining period over which the unamortized debt discount will be amortized is 3.25 years.