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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 15,770	$ 14,717	$ 13,794	$ 10,217	$ 11,420	$ 15,682	$ 14,725	$ 11,551	$ 54,498	$ 53,376	$ 45,728
Basic weighted average shares									52,572,496	52,924,398	54,045,841
Effect of dilutive stock options and restricted stock									506,238	525,356	435,643
Diluted weighted average shares									53,078,734	53,449,754	54,481,484
Basic (usd per share)	$ 0.30	$ 0.28	$ 0.26	$ 0.19	$ 0.22	$ 0.30	$ 0.28	$ 0.22	$ 1.04	$ 1.01	$ 0.85
Diluted (usd per share)	$ 0.30	$ 0.28	$ 0.26	$ 0.19	$ 0.21	$ 0.29	$ 0.27	$ 0.22	$ 1.03	$ 1.00	$ 0.84
Anti-dilutive shares (in shares)									785,825	469,603	146,548

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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