Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained (Deficit) Earnings	Total Stockholders' Equity	Non-controlling Interests	Private Perpetual Preferred Units
Beginning balance (in shares) at Dec. 31, 2018				173,874,000	1,038,000
Beginning balance at Dec. 31, 2018	$ 1,991,109			$ 1,739	$ 10	$ 1,204,075	$ (8,853)	$ 41,511	$ 1,238,482	$ 744,623	$ 8,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				5,204,000	(19,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 52		21,773	(171)		21,654	(21,654)
Equity compensation:
LTIP units	14,971									14,971
Restricted stock, net of forfeitures (in shares)				53,000
Restricted stock, net of forfeitures	421					421			421
Dividends and distributions	(96,370)							(56,098)	(56,098)	(39,570)	(702)
Net income (loss)	55,570							32,646	32,646	22,222	702
Other comprehensive income (loss)	(25,355)						(15,086)		(15,086)	(10,269)
Ending balance (in shares) at Sep. 30, 2019				179,131,000	1,019,000
Ending balance at Sep. 30, 2019	1,940,346			$ 1,791	$ 10	1,226,269	(24,110)	18,059	1,222,019	710,323	8,004
Beginning balance (in shares) at Jun. 30, 2019				176,991,000	1,030,000
Beginning balance at Jun. 30, 2019	1,948,032			$ 1,770	$ 10	1,213,170	(20,387)	21,084	1,215,647	724,381	8,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				2,141,000	(11,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 21		12,908	(133)		12,796	(12,796)
Equity compensation:
LTIP units	3,456									3,456
Restricted stock, net of forfeitures (in shares)				(1,000)
Restricted stock, net of forfeitures	191					191			191
Dividends and distributions	(32,180)							(18,907)	(18,907)	(13,039)	(234)
Net income (loss)	26,784							15,882	15,882	10,668	234
Other comprehensive income (loss)	(5,937)						(3,590)		(3,590)	(2,347)
Ending balance (in shares) at Sep. 30, 2019				179,131,000	1,019,000
Ending balance at Sep. 30, 2019	1,940,346			$ 1,791	$ 10	1,226,269	(24,110)	18,059	1,222,019	710,323	8,004
Beginning balance (in shares) at Dec. 31, 2019		180,877,597	1,016,799	180,878,000	1,017,000
Beginning balance at Dec. 31, 2019	1,947,913			$ 1,809	$ 10	1,232,433	(21,496)	15,764	1,228,520	690,242	29,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of private perpetual in exchange for common shares										(789)	789
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				5,160,000	(6,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 52		24,153	(302)		23,903	(23,903)
Repurchases of common shares (in shares)				(14,205,000)
Repurchases of common shares	(121,950)			$ (142)		(95,434)		(26,374)	(121,950)
Equity compensation:
LTIP units	19,455									19,455
Restricted stock, net of forfeitures (in shares)				148,000
Restricted stock, net of forfeitures	719					719			719
Dividends and distributions	(65,369)							(37,181)	(37,181)	(25,041)	(3,147)
Net income (loss)	(23,599)							(16,502)	(16,502)	(10,244)	3,147
Other comprehensive income (loss)	(13,354)						(8,240)		(8,240)	(5,114)
Ending balance (in shares) at Sep. 30, 2020		171,981,257	1,010,832	171,981,000	1,011,000
Ending balance at Sep. 30, 2020	1,743,815			$ 1,719	$ 10	1,161,871	(30,038)	(64,293)	1,069,269	644,606	29,940
Beginning balance (in shares) at Jun. 30, 2020				172,333,000	1,014,000
Beginning balance at Jun. 30, 2020	1,756,038			$ 1,723	$ 10	1,166,451	(31,874)	(56,089)	1,080,221	645,877	29,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				782,000	(3,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 8		2,419	(41)		2,386	(2,386)
Repurchases of common shares (in shares)				(1,134,000)
Repurchases of common shares	(7,345)			$ (12)		(7,333)			(7,345)
Equity compensation:
LTIP units	5,170									5,170
Restricted stock, net of forfeitures	334					334			334
Dividends and distributions	(1,050)										(1,050)
Net income (loss)	(12,269)							(8,204)	(8,204)	(5,115)	1,050
Other comprehensive income (loss)	2,937						1,877		1,877	1,060
Ending balance (in shares) at Sep. 30, 2020		171,981,257	1,010,832	171,981,000	1,011,000
Ending balance at Sep. 30, 2020	$ 1,743,815			$ 1,719	$ 10	$ 1,161,871	$ (30,038)	$ (64,293)	$ 1,069,269	$ 644,606	$ 29,940