Shareholders' Equity and Partners' Capital - Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ 6,067,739
Net income	$ 48,059	$ 43,875	106,228	$ 90,567
Other comprehensive income - cash flow hedges	6,281	$ (4,112)	22,636	$ (4,746)
Share-based compensation			940
Deemed contribution - tax sharing agreement			2,494
Dividends and distributions declared			(226,133)
Other			399
Balance	5,974,303		5,974,303
Total Class A Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			1,624,650
Net income			28,976
Other comprehensive income - cash flow hedges			6,033
Share-based compensation			251
Deemed contribution - tax sharing agreement			0
Dividends and distributions declared			(60,269)
Other			345
Balance	1,599,986		1,599,986
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			4,443,089
Net income			77,252
Other comprehensive income - cash flow hedges			16,603
Share-based compensation			689
Deemed contribution - tax sharing agreement			2,494
Dividends and distributions declared			(165,864)
Other			54
Balance	$ 4,374,317		$ 4,374,317