Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic
Net income									$ 159,718	$ 123,340	$ 60,100
Less: Earnings allocated to participating securities									(1,650)	0	0
Net income	$ 41,098	$ 41,375	$ 38,527	$ 38,718	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 158,068	$ 123,340	$ 60,100
Weighted average common shares outstanding (in shares)									60,339,714	53,963,047	37,705,556
Basic earnings per common share (in dollars per share)	$ 0.69	$ 0.69	$ 0.62	$ 0.62	$ 0.64	$ 0.46	$ 0.59	$ 0.61	$ 2.62	$ 2.29	$ 1.59
Diluted
Net income	$ 41,098	$ 41,375	$ 38,527	$ 38,718	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 158,068	$ 123,340	$ 60,100
Weighted average common shares outstanding (in shares)									60,339,714	53,963,047	37,705,556
Diluted effect of share-based compensation (in shares)									352,567	650,010	805,705
Weighted average diluted common shares (in shares)									60,692,281	54,613,057	38,511,261
Diluted earnings per common share (in dollars per share)	$ 0.69	$ 0.69	$ 0.62	$ 0.62	$ 0.63	$ 0.46	$ 0.58	$ 0.60	$ 2.60	$ 2.26	$ 1.56
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	17,524
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of stock options excluded (in shares)									0	0