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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Basic and Diluted [Abstract]      
Weighted average basic shares outstanding (in shares) 6,196 6,073 5,966
Potential common shares related to stock options (in shares) 62 34 41
Potential common shares related to unvested restricted stock awards (in shares) 15 8 5
Potential common shares related to warrants (in shares) 0 0 53
Weighted average diluted shares outstanding (in shares) 6,273 6,115 6,065
Net income $ 15,976 $ 23,134 $ 18,441
Basic EPS (in dollars per share) $ 2.58 $ 3.81 $ 3.09
Diluted EPS (in dollars per share) $ 2.55 $ 3.78 $ 3.04
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (in shares) 21 64 36