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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of computation of basic and diluted net income (loss) per share                      
Net income from continuing operations $ 6,341 $ 199,165 $ 22,027 $ (89) $ 6,730 $ 777 $ 1,288 $ 2,097 $ 229,824 $ 12,024 $ 8,832
Discontinued operations                     2,588
Net income $ 6,341 $ 199,165 $ 23,564 $ 754 $ 7,055 $ 1,280 $ 1,592 $ 2,097 $ 229,824 $ 12,024 $ 11,420
Shares used to compute basic income per share                 19,789,991 20,418,569 20,312,395
Dilutive potential common shares:                      
Restricted stock (shares)                 56,088 36,446 80,100
Stock options (shares)                 882,378 978,163 352,959
2019 Convertible Senior Notes (shares)                 499,430    
Shares used to compute diluted income per share (shares) 21,542,000 21,460,000 21,276,000 20,631,000 20,792,000 21,345,000 21,780,000 21,208,000 21,227,887 21,433,178 20,745,454
Basic per share amounts:                      
Income from continuing operations (in usd per share)                 $ 11.61 $ 0.59 $ 0.43
Discontinued operations (in usd per share)                     0.13
Net income (loss) (in usd per share) $ 0.32 $ 10.01 $ 1.19 $ 0.04 $ 0.35 $ 0.06 $ 0.08 $ 0.10 11.61 0.59 0.56
Diluted per share amounts:                      
Income from continuing operations (in usd per share)                 10.83 0.56 0.43
Discontinued operations (in usd per share)                     0.12
Net income (loss) (in usd per share) $ 0.29 $ 9.28 $ 1.11 $ 0.04 $ 0.34 $ 0.06 $ 0.07 $ 0.10 $ 10.83 $ 0.56 $ 0.55