Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings per share
Net income	$ 25,080	$ 23,253	$ 25,789	$ 45,958
Average common shares outstanding (in shares)	52,985	51,446	52,394	51,403
Net income per share (in dollars per share)	$ 0.47	$ 0.45	$ 0.49	$ 0.89
Diluted earnings per share
Average common shares outstanding (in shares)	52,985	51,446	52,394	51,403
Add: Dilutive effect of employee restricted stock and stock options (in shares)	323	506	413	595
Average diluted shares outstanding (in shares)	53,308	51,952	52,807	51,998
Net income per share (in dollars per share)	$ 0.47	$ 0.45	$ 0.49	$ 0.88