Earnings per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income from continuing operations	$ 32,066	$ 25,486	$ 59,011	$ 67,475
Preferred stock dividends	(10)	(11)	(30)	(29)
Income from continuing operations available to common equity	32,056	25,475	58,981	67,446
Dividends and undistributed earnings allocated to participating securities	(36)	(38)	(62)	(105)
Income from continuing operations available to common shareholders	32,020	25,437	58,919	67,341
Net income from discontinued operations	0	(1,300)	0	(455)
Preferred stock dividends	0	1	0	(1)
Income from discontinued operations available to common equity	0	(1,299)	0	(456)
Dividends and undistributed earnings allocated to participating securities	0	2	0	1
Income from discontinued operations available to common shareholders	$ 0	$ (1,297)	$ 0	$ (455)
Basic weighted-average shares outstanding (shares)	38,074	37,487	37,970	37,407
Stock options and other stock compensation (shares)	628	625	722	501
Diluted weighted-average shares outstanding (shares)	38,702	38,112	38,692	37,908
Antidilutive stock options (shares)	0	0	0	0
Earnings per share attributable to continuing operations:
Earnings per share attributable to continuing operations, basic (dollars per share)	$ 0.84	$ 0.68	$ 1.55	$ 1.80
Earnings per share attributable to continuing operations, diluted (dollars per share)	0.83	0.67	1.52	1.77
Earnings (loss) per share attributable to discontinued operations:
Earnings per share attributable to discontinued operations, basic (dollars per share)	0.00	(0.04)	0.00	(0.01)
Earnings per share attributable to discontinued operations, diluted (dollars per share)	$ 0.00	$ (0.04)	$ 0.00	$ (0.01)