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Earnings per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 32,371	$ 14,413
Preferred stock dividends	10	10
Net income available to common equity	32,361	14,403
Dividends and undistributed earnings allocated to participating securities	32	17
Net income available to common shareholders	$ 32,329	$ 14,386
Basic weighted-average shares outstanding	38,216	37,766
Stock options and other stock compensation	562	827
Diluted weighted-average shares outstanding	38,778	38,593
Antidilutive stock options	0	0
Earnings per share:
Basic	$ 0.85	$ 0.38
Diluted	$ 0.83	$ 0.37

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Earnings Per Share, Continuing Operations [Abstract]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in stock.

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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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