Net Earnings Per Share (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares
Anti-dilutive securities
Number of classes of common stock | item	2
Numerator
Net income available to common stockholders | $	$ 133,307	$ 138,094
Denominator
Weighted-average common shares outstanding	113,471,945	111,018,279
Basic earnings per share (in dollars per share) | $ / shares	$ 1.17	$ 1.24
Numerator
Net income | $	$ 137,151	$ 138,094
Preferred stock dividends | $	(3,844)
Net income available to common stockholders | $	$ 133,307	$ 138,094
Denominator
Number of shares used in basic computation	113,471,945	111,018,279
Weighted-average effect of dilutive securities (in shares)	313,083	1,362,577
Number of shares used in per share computation	113,785,028	112,380,856
Diluted net income per share (in dollars per share) | $ / shares	$ 1.17	$ 1.23
Restricted Stock Units
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares)	990,100	940,470