Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Basic weighted average number of shares outstanding		12,825,944	13,269,024	12,940,129	13,252,596
Net dilutive effect of share-based awards, treasury method	[1]	1,007,050	871,239	906,010	790,730
Diluted weighted average number of shares outstanding		13,832,994	14,140,263	13,846,139	14,043,326
Net Income (Loss) Attributable to Parent		$ 3,949	$ 5,071	$ 27,518	$ 20,631
Diluted		$ 0.31	$ 0.38	$ 2.13	$ 1.56
Net loss per share (in dollars per share)		$ 0.29	$ 0.36	$ 1.99	$ 1.47

[1] For both the three and nine months ended September 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 nine months ended September 30, 2018).