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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 9,520 | $ 14,065 | $ 9,713 | $ 32,693 | $ 6,339 | $ 11,950 | $ 7,314 | $ 13,787 | $ 65,991 | $ 39,390 | $ 28,004
Less distributed and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | 1,496 | 981 | 2,002
Net income allocated to common shares |  |  |  |  |  |  |  |  | $ 64,495 | $ 38,409 | $ 26,002
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 20,834 | 24,308 | 24,708
Incremental shares from assumed conversions of common stock options and LTIP awards |  |  |  |  |  |  |  |  | 47 | 7 | 4
Adjusted weighted average common shares outstanding |  |  |  |  |  |  |  |  | 20,881 | 24,315 | 24,712
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect |  |  |  |  |  |  |  |  | 0 | 0 | 4
Special dividend, per share |  |  |  |  |  |  |  |  |  |  | $ 2.00
EPS impact under two class method of dividends exceeding earnings |  |  |  |  |  |  |  |  |  |  | $ 0.05

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