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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic and Diluted Earnings Per Share
Net Income	$ 31,041	$ 30,957	$ 30,451	$ 28,682	$ 29,508	$ 29,614	$ 29,335	$ 27,670	$ 121,131	$ 116,127	$ 112,755
Average outstanding shares - basic									76,278,463	75,542,455	74,641,957
Add: dilutive restricted stock awards									63,373	53,126	45,358
Average outstanding shares - diluted									76,341,836	75,595,581	74,687,315
Basic earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51
Diluted earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51
Earnings Per Share
Restricted stock awards excluded from the diluted average outstanding share calculation									0	0	0

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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