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Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Basic weighted average number of shares outstanding		13,020,344	13,239,628
Net dilutive effect of share-based awards, treasury method	[1]	830,977	737,864
Diluted weighted average number of shares outstanding		13,851,321	13,977,492
Net Income (Loss) Attributable to Parent		$ 11,194	$ 6,705
Diluted		$ 0.86	$ 0.51
Net loss per share (in dollars per share)		$ 0.81	$ 0.48
[1] For the three months ended March 31, 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 three months ended March 31, 2018).

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