Earnings Per Common Share - Schedule of Reconciliation of Amounts Used in Basic and Diluted EPS Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic and Diluted Earnings Per Common Share
Net income									$ 22,773	$ 2,595	$ 17,660
Basic EPS - Weighted average number of common shares outstanding									11,993	12,269	11,847
Dilutive effect of stock awards									444	825	681
Diluted EPS - Weighted average number of common shares outstanding									12,437	13,094	12,528
Net earnings per share: Basic	$ 0.50	$ 0.50	$ 0.66	$ 0.24	$ (0.27)	$ (0.06)	$ 0.19	$ 0.34	$ 1.90	$ 0.21	$ 1.49
Net earnings per share: Diluted	$ 0.48	$ 0.47	$ 0.64	$ 0.23	$ (0.27)	$ (0.06)	$ 0.18	$ 0.31	$ 1.83	$ 0.20	$ 1.41