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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 ($)
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Debt Instrument [Line Items]      
Amount of the equity component [1] $ 45,808,000 $ 45,808,000  
2.25% convertible senior notes due 2019 330,000,000 330,000,000 $ 330,000,000
Unamortized debt discount [2] (38,588,000) (42,844,000)  
Unamortized transaction costs related to the debt component (5,933,000) (6,526,000)  
Contractual coupon interest accrual 3,713,000 3,733,000  
Contractual Coupon Interest Payment (3,713,000) (3,733,000)  
Net carrying amount $ 285,479,000 $ 280,630,000  
[1] Net of $1,177 thousands of transaction costs related to the equity component of the Notes.
[2] As of June 30, 2015, the remaining period over which the unamortized debt discount will be amortized is 4 years.