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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 12,948	$ 13,251	$ 11,130	$ 8,399	$ 10,533	$ 12,440	$ 11,363	$ 9,822	$ 45,728	$ 44,158	$ 37,547
Basic weighted average shares									54,045,841	54,809,319	55,119,150
Effect of dilutive stock options and restricted stock									435,643	559,697	468,231
Diluted weighted average shares									54,481,484	55,369,016	55,587,381
Basic (usd per share)	$ 0.24	$ 0.24	$ 0.21	$ 0.16	$ 0.19	$ 0.23	$ 0.21	$ 0.18	$ 0.85	$ 0.81	$ 0.68
Diluted (usd per share)	$ 0.24	$ 0.24	$ 0.20	$ 0.15	$ 0.19	$ 0.22	$ 0.20	$ 0.17	$ 0.84	$ 0.80	$ 0.68
Anti-dilutive shares (in shares)									146,548	32,436	206,264

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