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Basis of Presentation (Earnings (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Summary of computation of basic and diluted net income (loss) per share        
Net income: $ 224,539 $ 1,280 $ 248,857 $ 4,969
Shares used to compute basic income per share 19,886,877 20,417,187 19,741,081 20,584,469
Dilutive potential common shares:        
Restricted stock 63,324 22,531 55,899 37,387
Stock options 763,856 905,593 922,051 1,010,665
0.75% Convertible Senior Notes, Due 2019 745,591 0 402,941 0
Shares used to compute diluted income per share 21,459,648 21,345,311 21,121,972 21,632,521
Basic per share amounts:        
Net income (in usd per share) $ 11.29 $ 0.06 $ 12.61 $ 0.24
Diluted per share amounts:        
Net income (in usd per share) $ 10.46 $ 0.06 $ 11.78 $ 0.23