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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerators:    
Net income available for Common Stockholders – Basic $ 65,240 $ 66,875
Amounts allocated to dilutive securities 3,747 3,849
Net income available for Common Stockholders – Fully Diluted $ 68,987 $ 70,724
Denominators:    
Weighted average common shares outstanding – basic (in shares) 181,945 181,729
Effect of dilutive securities:    
Exchange of common OP units for common shares (in shares) 10,473 10,491
Stock options and restricted stock (in shares) 267 344
Weighted average common shares outstanding – fully diluted (in shares) 192,685 192,564
Earnings per common share – basic (usd per share) $ 0.36 $ 0.37
Earnings per common share – fully diluted (usd per share) $ 0.36 $ 0.37