Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic earnings per share
Net income	$ 22,628	$ 25,605	$ 48,417	$ 71,563
Average common shares outstanding (in shares)	53,978	51,473	52,926	51,426
Net income per share (in dollars per share)	$ 0.42	$ 0.50	$ 0.91	$ 1.39
Diluted earnings per share
Average common shares outstanding (in shares)	53,978	51,473	52,926	51,426
Add: Dilutive effect of employee restricted stock and stock options (in shares)	323	462	399	570
Average diluted shares outstanding (in shares)	54,301	51,935	53,325	51,996
Net income per share (in dollars per share)	$ 0.42	$ 0.49	$ 0.91	$ 1.38