Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,835,000	43,785,000
Net income available to common stockholders	$ 10,368	$ 29,127
Basic EPS (in dollars per share)	$ 0.24	$ 0.67
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,835,000	43,785,000
Dilutive effect of common stock options and restricted stock (in shares)	295,000	296,000
Weighted average common shares and common share equivalents (in shares)	44,130,000	44,081,000
Net income available to common stockholders	$ 10,368	$ 29,127
Diluted EPS (in dollars per share)	$ 0.23	$ 0.66
Stock Options [Member]
Earnings Per Share [Abstract]
Stock options excluded from calculation of diluted EPS (in shares)	1,500	1,500