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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 36,414	$ 43,674
Preferred stock dividends	(10)	(10)
Net income available to common equity	36,404	43,664
Dividends and undistributed earnings allocated to participating securities	(14)	(33)
Net income available to common shareholders	$ 36,390	$ 43,631
Basic weighted-average shares outstanding (shares)	39,094	38,824
Stock options and other stock compensation (shares)	326	528
Diluted weighted-average shares outstanding (shares)	39,420	39,352
Antidilutive stock options (shares)	0	0
Earnings per share:
Basic (in dollars per share)	$ 0.93	$ 1.12
Diluted (in dollars per share)	$ 0.92	$ 1.11

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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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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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