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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income as reported	$ 29,069	$ 22,516	$ 63,649	$ 65,688
Weighted average common shares outstanding (in shares)	26,778,000	23,148,000	25,878,000	23,129,000
Additional dilutive common stock equivalents (in shares)	90,000	181,000	98,000	211,000
Weighted average diluted common shares outstanding (in shares)	26,868,000	23,329,000	25,976,000	23,340,000
Basic earnings per common share (in dollars per share)	$ 1.09	$ 0.97	$ 2.46	$ 2.84
Diluted earnings per common share (in dollars per share)	$ 1.08	$ 0.97	$ 2.45	$ 2.81
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	21,000		26,000	0

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