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Summary of Operations and Significant Accounting Policies - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]                      
Net income $ 75,830 $ 9,612 $ 7,860 $ 4,376 $ (2,908) $ (8,654) $ (12,447) $ (6,132) $ 97,678 $ (30,141) $ 1,387
Less: Undistributed income (loss) allocated to participating securities                 1,105 (275) 18
Income (loss) attributable to common stockholders                 $ 96,573 $ (29,866) $ 1,369
Basic weighted-average number of common shares outstanding (in shares) 21,693 21,740 21,875 21,849 21,676 21,687 21,715 21,696 21,931 21,773 21,554
Add: dilutive effect of equity instruments (in shares)                 303 0 525
Diluted weighted-average number of common shares outstanding (in shares) 22,061 22,098 22,187 22,177 21,676 21,687 21,715 21,696 22,234 21,773 22,079
Earnings (loss) per share - basic (in dollars per share) $ 3.45 $ 0.44 $ 0.36 $ 0.20 $ (0.13) $ (0.40) $ (0.57) $ (0.28) $ 4.40 $ (1.37) $ 0.06
Earnings (loss) per share - diluted (in dollars per share) $ 3.39 $ 0.43 $ 0.35 $ 0.20 $ (0.13) $ (0.40) $ (0.57) $ (0.28) $ 4.34 $ (1.37) $ 0.06