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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 11,691	$ 13,794	$ 15,951	$ 24,011
Basic weighted average shares (in shares)	52,383,842	52,615,366	52,348,912	52,624,782
Effect of dilutive stock options and restricted stock (in shares)	333,945	535,768	405,133	551,643
Diluted weighted average shares (in shares)	52,717,787	53,151,134	52,754,045	53,176,425
Basic (usd per share)	$ 0.22	$ 0.26	$ 0.30	$ 0.46
Diluted (usd per share)	$ 0.22	$ 0.26	$ 0.30	$ 0.45
Anti-dilutive shares (in shares)	2,161,244	760,438	1,919,008	772,202

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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