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Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic
Net Income	$ 5,480	$ 21,274	$ 45,483	$ 74,331
Weighted average common shares outstanding (in shares)	30,160,991	30,482,966	30,375,873	30,482,966
EPS – Basic (in dollars per share)	$ 0.18	$ 0.70	$ 1.50	$ 2.44
Diluted
Dilutive effect of unvested equity awards and other stock-based holdings (in shares)	822,843	676,744	813,767	530,640
Weighted average common shares outstanding (in shares)	30,983,834	31,159,710	31,189,640	31,013,606
EPS – Diluted (in dollars per share)	$ 0.18	$ 0.68	$ 1.46	$ 2.40

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