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Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic
Net Income	$ 11,593	$ 27,293
Weighted average common shares outstanding (in shares)	30,488,601	30,482,966
EPS – Basic (in dollars per share)	$ 0.38	$ 0.90
Diluted
Dilutive effect of unvested equity awards and other stock-based holdings (in shares)	796,764	411,288
Weighted average common shares outstanding – Diluted (in shares)	31,285,365	30,894,254
EPS – Diluted (in dollars per share)	$ 0.37	$ 0.88

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