Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 16,996	$ (7,640)	$ 14,805	$ (762)	$ 9,356	$ 14,043
Weighted average common shares outstanding, basic (in shares)	48,136		48,073		48,111	48,051
Weighed average common shares outstanding, dilutive (in shares)	48,136		48,073		48,111	48,051
Earnings per share - basic (in dollars per share)	$ 0.35		$ 0.31		$ 0.19	$ 0.29
Earnings per share - diluted (in dollars per share)	$ 0.35		$ 0.31		$ 0.19	$ 0.29