Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 51,853	$ 14,628
Earnings allocated to participating securities - nonvested restricted shares	155	249
Earnings allocated to common shareholders, Basic	$ 51,698	$ 14,379
Weighted average common shares outstanding	70,869	71,206
Basic earnings per common share	$ 0.73	$ 0.20
Earnings allocated to common shareholders, Diluted	$ 51,698	$ 14,379
Dilutive effect of equity awards	240	58
Weighted average diluted common shares outstanding	71,109	71,264
Diluted earnings per common share	$ 0.73	$ 0.20
Potentially dilutive stock awards and units that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	70	6