Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Basic weighted average number of shares outstanding		12,976,235	13,248,812	12,998,168	13,244,245
Net dilutive effect of share-based awards, treasury method	[1]	885,518	801,761	859,448	761,311
Diluted weighted average number of shares outstanding		13,861,753	14,050,573	13,857,616	14,005,556
Net Income (Loss) Attributable to Parent		$ 12,375	$ 8,855	$ 23,569	$ 15,560
Diluted		$ 0.95	$ 0.67	$ 1.81	$ 1.17
Net loss per share (in dollars per share)		$ 0.89	$ 0.63	$ 1.70	$ 1.11

[1] For both the three and six months ended June 30, 2019, the diluted net income per share computation does not include the anti-dilutive effect of 7,628 shares of Class A Stock granted under share-based compensation arrangements (4,050 shares for both the three and six months ended June 30, 2018).