Earnings per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income from continuing operations	$ 12,532	$ 29,306	$ 26,945	$ 41,989
Preferred stock dividends	(10)	(9)	(20)	(19)
Income from continuing operations available to common equity	12,522	29,297	26,925	41,970
Dividends and undistributed earnings allocated to participating securities	(10)	(48)	(26)	(67)
Income from continuing operations available to common shareholders	12,512	29,249	26,899	41,903
Net income from discontinued operations	0	1,777	0	845
Preferred stock dividends	0	(1)	0	(1)
Income from discontinued operations available to common equity	0	1,776	0	844
Dividends and undistributed earnings allocated to participating securities	0	(3)	0	(2)
Income from discontinued operations available to common shareholders	$ 0	$ 1,773	$ 0	$ 842
Basic weighted-average shares outstanding (shares)	38,065	37,411	37,914	37,368
Stock options and other stock compensation (shares)	715	449	771	439
Diluted weighted-average shares outstanding (shares)	38,780	37,860	38,685	37,807
Antidilutive stock options (shares)	0	143	0	143
Earnings per share attributable to continuing operations:
Earnings per share attributable to continuing operations, basic (dollars per share)	$ 0.33	$ 0.78	$ 0.71	$ 1.12
Earnings per share attributable to continuing operations, diluted (dollars per share)	0.32	0.77	0.70	1.11
Earnings per share attributable to discontinued operations:
Earnings per share attributable to discontinued operations, basic (dollars per share)	0.00	0.05	0.00	0.02
Earnings per share attributable to discontinued operations, diluted (dollars per share)	$ 0.00	$ 0.05	$ 0.00	$ 0.02