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Net Income per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 28,556	$ 24,560	$ 104,845	$ 74,551
Less distributed and undistributed earnings allocated to participating securities	309	346	1,183	1,064
Net Income (Loss) Available to Common Stockholders, Basic	$ 28,247	$ 24,214	$ 103,662	$ 73,487
Weighted average common shares outstanding basic (in shares)	40,771	41,377	40,640	41,301
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	145	156	140	324
Weighted Average Number of Shares Outstanding, Diluted	40,916	41,533	40,780	41,625

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