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Earnings Per Share - Earnings Allocable to Common Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator for basic earnings per share:        
Net income allocable to common shareholders $ 362,715 $ 42,873 $ 345,150 $ 69,680
Numerator for diluted earnings per share:        
Net income allocable to common shareholders $ 364,965 $ 45,123 $ 349,650 $ 74,180
Denominator for basic and diluted earnings per share:        
Weighted average common shares outstanding for basic earnings per common share (in shares) 64,019 67,932 65,873 67,922
Add: Effect of assumed shares issued under treasury stock method for restricted stock units (in shares) 87 127 85 125
Add: Effect of series J convertible perpetual preferred stock (in shares) 16,153 15,635 16,053 15,635
Weighted average common shares outstanding for diluted earnings per common share (in shares) 80,259 83,694 82,011 83,682
Basic earnings per common share:        
Net income (loss) allocable to common shareholders (in dollars per share) $ 5.67 $ 0.63 $ 5.24 $ 1.03
Diluted earnings per common share:(1)        
Net income (loss) allocable to common shareholders (in dollars per share) $ 4.55 $ 0.54 $ 4.26 $ 0.89