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EPS Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income $ 100,621 $ 95,599 $ 93,040 $ 88,857 $ 60,879 $ 87,132 $ 70,395 $ 83,395 $ 378,117 $ 301,801 $ 322,393
Dividends declared on preferred stock ($1.875 per share)                 (15,000) (15,000) (15,000)
Dividends, dividend equivalents and undistributed earnings allocated to participating securities                 (1,087) (943) (891)
Net income available to common stock and participating securities $ 96,871 $ 91,849 $ 89,290 $ 85,107 $ 57,129 $ 83,382 $ 66,645 $ 79,645 $ 362,030 $ 285,858 $ 306,502
Denominator:                      
Basic weighted average common shares outstanding (in shares)                 450,972 418,934 388,357
Basic EPS (in dollars per share)                 $ 0.80 $ 0.68 $ 0.79
Interest on Convertible Debt, Net of Tax                 $ 8,965 $ 0 $ 0
Net income to common stockholders - diluted                 $ 370,995 $ 285,858 $ 306,502
Effect of assumed Convertible Senior Notes conversion to common shares (in shares)                 16,797 0 0
Diluted weighted average common shares outstanding (in shares)                 467,769 418,934 388,357
Diluted Earnings per Common Share (in dollars per share)                 $ 0.79 $ 0.68 $ 0.79
Anti-dilutive securities excluded from diluted earnings per share calculations (in shares)                 3,300    
Restricted Stock Units                      
Denominator:                      
Weighted average grant date fair value (in dollars per share) $ 7.24               $ 7.24