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Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net Income	$ 15,346	$ 20,174	$ 28,410	$ 11,593	$ 35,520	$ 40,003
Weighted average common shares outstanding (in shares)	28,162,007		30,481,627		28,489,486	30,485,095
EPS – Basic (in dollars per share)	$ 0.54		$ 0.93		$ 1.25	$ 1.31
Diluted
Dilutive effect of equity awards and other stock-based holdings (in shares)	974,972		823,541		970,663	809,228
Weighted average common shares outstanding (in shares)	29,136,979		31,305,168		29,460,149	31,294,323
EPS – Diluted (in dollars per share)	$ 0.53		$ 0.91		$ 1.21	$ 1.28

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