Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,474	43,637	43,517	43,735
Net income available to common stockholders	$ 40,296	$ 24,713	$ 80,142	$ 35,081
Basic EPS (in dollars per share)	$ 0.93	$ 0.57	$ 1.84	$ 0.80
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,474	43,637	43,517	43,735
Dilutive effect of common stock options and restricted stock (in shares)	319	291	323	291
Weighted average common shares and common share equivalents (in shares)	43,793	43,928	43,840	44,026
Net income available to common stockholders	$ 40,296	$ 24,713	$ 80,142	$ 35,081
Diluted EPS (in dollars per share)	$ 0.92	$ 0.56	$ 1.83	$ 0.80