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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, 2018	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average basic shares outstanding (in shares)	[1]	13,864	12,392
Potential common shares related to stock options (in shares)		136	123
Potential common shares related to unvested restricted stock awards (in shares)		29	30
Weighted average diluted shares outstanding (in shares)	[1]	14,029	12,545
Net income		$ 32,622	$ 15,976
Basic EPS (in dollars per share)	[1]	$ 2.35	$ 1.29
Diluted EPS (in dollars per share)	[1]	$ 2.33	$ 1.27
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (in shares)		44	42
[1] Share and per share data have been adjusted to reflect the two-for-one stock split effective November 27, 2018.

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