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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 23,232	$ 32,371
Preferred stock dividends	(10)	(10)
Net income available to common equity	23,222	32,361
Dividends and undistributed earnings allocated to participating securities	(22)	(32)
Net income available to common shareholders	$ 23,200	$ 32,329
Basic weighted-average shares outstanding (shares)	38,536	38,216
Stock options and other stock compensation (shares)	548	562
Diluted weighted-average shares outstanding (shares)	39,084	38,778
Antidilutive stock options (shares)	0	0
Earnings per share:
Basic (in dollars per share)	$ 0.60	$ 0.85
Diluted (in dollars per share)	$ 0.59	$ 0.83

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Earnings Per Share, Continuing Operations [Abstract]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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