Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Total Stockholders' Equity	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)	Non-controlling Interests	Private Perpetual Preferred Units
Beginning balance (in shares) at Dec. 31, 2019					180,878	1,017
Beginning balance at Dec. 31, 2019	$ 1,947,913			$ 1,228,520	$ 1,809	$ 10	$ 1,232,433	$ (21,496)	$ 15,764	$ 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	(6)
Conversion of operating partnership units and Class B shares to Class A shares	0			23,903	$ 52		24,153	(302)		(23,903)
Repurchases of common shares (in shares)					(14,205)
Repurchases of common shares	(121,950)			(121,950)	$ (142)		(95,434)		(26,374)
Equity compensation:
LTIP units	19,455									19,455
Restricted stock, net of forfeitures (in shares)					148
Restricted stock, net of forfeitures	719			719			719
Dividends and distributions	(65,369)			(37,181)					(37,181)	(25,041)	(3,147)
Net 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	1,011
Ending balance at Sep. 30, 2020	1,743,815			1,069,269	$ 1,719	$ 10	1,161,871	(30,038)	(64,293)	644,606	29,940
Beginning balance (in shares) at Jun. 30, 2020					172,333	1,014
Beginning balance at Jun. 30, 2020	1,756,038			1,080,221	$ 1,723	$ 10	1,166,451	(31,874)	(56,089)	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	(3)
Conversion of operating partnership units and Class B shares to Class A shares	0			2,386	$ 8		2,419	(41)		(2,386)
Repurchases of common shares (in shares)					(1,134)
Repurchases of common shares	(7,345)			(7,345)	$ (12)		(7,333)		0
Equity compensation:
LTIP units	5,170									5,170
Restricted stock, net of forfeitures (in shares)					0
Restricted stock, net of forfeitures	334			334			334
Dividends and distributions	(1,050)			0					0	0	(1,050)
Net 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	1,011
Ending balance at Sep. 30, 2020	1,743,815			1,069,269	$ 1,719	$ 10	1,161,871	(30,038)	(64,293)	644,606	29,940
Beginning balance (in shares) at Dec. 31, 2020		170,555	1,010		170,555	1,010
Beginning balance at Dec. 31, 2020	1,731,307			1,055,249	$ 1,705	$ 10	1,147,527	(28,320)	(65,673)	646,118	29,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)					2,693	(11)
Conversion of operating partnership units and Class B shares to Class A shares	0			7,766	$ 27		7,755	(16)		(7,766)
Repurchases of common shares (in shares)					(1,009)
Repurchases of common shares	(10,043)			(10,043)	$ (10)		(6,699)		(3,334)
Equity compensation:
LTIP units	15,072									15,072
Restricted stock, net of forfeitures (in shares)					54
Restricted stock, net of forfeitures	344			344	$ 1		343
Dividends and distributions	(22,584)			(12,124)					(12,124)	(7,309)	(3,151)
Net loss	(8,963)			(7,523)					(7,523)	(4,591)	3,151
Other comprehensive income (loss)	8,548			5,309				5,309		3,239
Ending balance (in shares) at Sep. 30, 2021		172,293	999		172,293	999
Ending balance at Sep. 30, 2021	1,713,681			1,038,978	$ 1,723	$ 10	1,148,926	(23,027)	(88,654)	644,763	29,940
Beginning balance (in shares) at Jun. 30, 2021					172,399	1,001
Beginning balance at Jun. 30, 2021	1,733,208			1,055,659	$ 1,724	$ 10	1,151,979	(24,794)	(73,260)	647,609	29,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)					544	(2)
Conversion of operating partnership units and Class B shares to Class A shares	0			931	$ 6		914	11		(931)
Repurchases of common shares (in shares)					(626)
Repurchases of common shares	(6,510)			(6,510)	$ (6)		(4,148)		(2,356)
Equity compensation:
LTIP units	5,198									5,198
Restricted stock, net of forfeitures (in shares)					(24)
Restricted stock, net of forfeitures	180			180	$ (1)		181
Dividends and distributions	(11,029)			(6,061)					(6,061)	(3,918)	(1,050)
Net loss	(10,183)			(6,977)					(6,977)	(4,256)	1,050
Other comprehensive income (loss)	2,817			1,756				1,756		1,061
Ending balance (in shares) at Sep. 30, 2021		172,293	999		172,293	999
Ending balance at Sep. 30, 2021	$ 1,713,681			$ 1,038,978	$ 1,723	$ 10	$ 1,148,926	$ (23,027)	$ (88,654)	$ 644,763	$ 29,940