Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic
Net income	$ 67,136	$ 66,566	$ (99,091)	$ 25,740	$ 41,098	$ 41,375	$ 38,527	$ 38,718	$ 60,351	$ 159,718	$ 123,340
Less: Dividends and earnings allocated to participating securities									(798)	(1,650)	0
Net income allocated to common stockholders									$ 59,553	$ 158,068	$ 123,340
Weighted average common shares outstanding (in shares)									79,209,560	60,339,714	53,963,047
Basic earnings per common share (in dollars per share)	$ 0.71	$ 0.71	$ (1.41)	$ 0.43	$ 0.69	$ 0.69	$ 0.62	$ 0.62	$ 0.75	$ 2.62	$ 2.29
Diluted
Net income allocated to common stockholders									$ 59,553	$ 158,068	$ 123,340
Weighted average common shares outstanding (in shares)									79,209,560	60,339,714	53,963,047
Diluted effect of share-based compensation (in shares)									287,513	352,567	650,010
Dilutive effect of stock warrants (in shares)									9,201	0	0
Weighted average diluted common shares (in shares)									79,506,274	60,692,281	54,613,057
Diluted earnings per common share (in dollars per share)	$ 0.71	$ 0.70	$ (1.41)	$ 0.43	$ 0.69	$ 0.69	$ 0.62	$ 0.62	$ 0.75	$ 2.60	$ 2.26
Restricted Stock Units RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of stock options excluded (in shares)										0	0
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of stock options excluded (in shares)									737	0