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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ 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
Numerator:
Net Earnings	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 33,412	$ (6,195)	$ 46,614
Basic - Weighted Average Shares Outstanding									17,940,438	17,695,390	17,523,267
Effect of dilutive securities									398,131	0	452,916
Diluted - Weighted Average Shares Outstanding									18,338,569	17,695,390	17,976,183
Basic Earnings per Share	$ 0.43	$ 0.54	$ 0.71	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.86	$ (0.35)	$ 2.66
Diluted (in dollars per share)	$ 0.42	$ 0.52	$ 0.69	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.82	$ (0.35)	$ 2.59
Anti-dilutive securities excluded from earnings per share calculation (in shares)									293,356	711,212	356,598

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