Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income as reported	$ 17,951	$ 29,069	$ 45,453	$ 63,649
Weighted average common shares outstanding (in shares)	26,217,000	26,778,000	26,290,000	25,878,000
Additional dilutive common stock equivalents (in shares)	11,000	90,000	21,000	98,000
Weighted average diluted common shares outstanding (in shares)	26,228,000	26,868,000	26,311,000	25,976,000
Basic earnings per common share (in dollars per share)	$ 0.68	$ 1.09	$ 1.73	$ 2.46
Diluted earnings per common share (in dollars per share)	$ 0.68	$ 1.08	$ 1.73	$ 2.45
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	132,000	21,000	139,000	26,000