Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Income per Share
Net income available to common stockholders	$ 202,859	$ 95,869
Weighted average shares outstanding-basic (shares)	222,163,324	207,809,383
Potentially dilutive common shares:
Unvested incentive units (shares)	224,558	323,064
Unvested restricted stock	158,022
Forward equity offering (shares)	1,392,934	221,448
Market performance-based awards (shares)	535,457	172,354
Weighted average shares/units outstanding-diluted (shares/units)	224,474,295	208,526,249
Income per share:
Basic (in dollars per share)	$ 0.91	$ 0.46
Diluted (in dollars per share)	$ 0.90	$ 0.46

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