Summary of Significant Accounting Policies - Schedule of Computation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Net income attributable to common stockholders	$ 215,983	$ 93,764	$ 87,006	$ 82,282	$ 82,403	$ 118,088	$ 83,044	$ 82,592	$ 479,013	$ 366,127	$ 189,474
Earnings and dividends allocated to participating securities									(975)	(792)	(601)
Earnings for basic computations									478,038	365,335	188,873
Earnings and dividends allocated to participating securities									0	792	0
Income allocated to noncontrolling interest - Preferred Operating Partnership Units and Operating Partnership Units									30,088	0	14,790
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership Units (Series A)									(3,119)	0	(5,088)
Net income for diluted computations									$ 505,007	$ 366,127	$ 198,575
Weighted average common shares outstanding:
Average number of common shares outstanding - basic (in shares)									125,967,831	125,087,554	119,816,743
OP Units (in shares)									5,590,831	0	5,451,357
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested restricted stock awards included for treasury stock method (in shares)									0	299,585	0
Shares related to exchangeable senior notes and dilutive stock options (in shares)									640,068	560,937	775,289
Average number of common shares outstanding - diluted (in shares)									134,155,771	125,948,076	126,918,869
Earnings per common share
Basic (in dollars per share)	$ 1.71	$ 0.74	$ 0.69	$ 0.65	$ 0.65	$ 0.94	$ 0.66	$ 0.66	$ 3.79	$ 2.92	$ 1.58
Diluted (in dollars per share)	$ 1.69	$ 0.74	$ 0.69	$ 0.64	$ 0.65	$ 0.93	$ 0.66	$ 0.66	$ 3.76	$ 2.91	$ 1.56
Series A Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Series A&D Units (in shares)									875,480	0	875,480
Series D Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Series A&D Units (in shares)									1,081,561	0	0