Condensed Consolidated Statement of Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Shareholders’ equity	Common Stock Class A common shares/units	Common Stock Class B common shares	Preferred shares	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income	Noncontrolling interest
Beginning balances at Dec. 31, 2017	$ 5,875,824	$ 5,149,629	$ 2,861	$ 6	$ 384	$ 5,600,256	$ (453,953)	$ 75	$ 726,195
Beginning balance (in shares) at Dec. 31, 2017			286,114,637	635,075	38,350,000
Increase (Decrease) in Stockholders' Equity
Share-based compensation	2,750	2,750				2,750
Common stock issued under share-based compensation plans, net of shares withheld for employee taxes	10,889	10,889	$ 7			10,882
Common stock issued under share-based compensation plans, net of shares withheld for employee taxes (in shares)			736,918
Issuance of perpetual preferred shares, net of offering costs of $4,022	110,978	110,978			$ 46	110,932
Issuance of perpetual preferred shares, net of offering costs of $4,022 (in shares)					4,600,000
Redemption of Series C participating preferred shares into Class A common shares	28,258	28,258	$ 109		$ (76)	60,440	(32,215)
Redemptions of Series C participating preferred shares into Class A common shares (in shares)			10,848,827		(7,600,000)
Repurchase of Class A common shares	(34,969)	(34,969)	$ (18)			(34,951)
Repurchases of Class A common shares (in shares)			(1,804,163)
Liquidation of consolidated joint venture	(241)	(1,849)					(1,849)		1,608
Distributions to equity holders:
Preferred shares	(38,804)	(38,804)					(38,804)
Noncontrolling interests	(8,303)								(8,303)
Common shares	(44,033)	(44,033)					(44,033)
Net income	77,704	76,859					76,859		845
Total other comprehensive income	8,951	8,951						8,951
Ending balances at Sep. 30, 2018	$ 5,989,004	$ 5,268,659	$ 2,959	$ 6	$ 354	$ 5,750,309	$ (493,995)	$ 9,026	$ 720,345
Ending balance (in shares) at Sep. 30, 2018			295,896,219	635,075	35,350,000