Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ 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					180,878,000	1,017,000
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)					4,378,000	(3,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			21,517	$ 44		21,734	(261)		(21,517)
Repurchases of common shares (in shares)					(13,071,000)
Repurchases of common shares	(114,605)			(114,605)	$ (130)		(88,101)		(26,374)
Equity compensation:
LTIP units	14,285									14,285
Restricted stock, net of forfeitures (in shares)					148,000
Restricted stock, net of forfeitures	385			385			385
Dividends and distributions	(64,319)			(37,181)					(37,181)	(25,041)	(2,097)
Net income (loss)	(11,330)			(8,298)					(8,298)	(5,129)	2,097
Other comprehensive income (loss)	(16,291)			(10,117)				(10,117)		(6,174)
Ending balance (in shares) at Jun. 30, 2020					172,333,000	1,014,000
Ending 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
Beginning balance (in shares) at Mar. 31, 2020					176,113,000	1,015,000
Beginning balance at Mar. 31, 2020	1,849,876			1,148,584	$ 1,761	$ 10	1,195,885	(32,106)	(16,966)	671,352	29,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)					2,718,000	(1,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			13,955	$ 27		14,073	(145)		(13,955)
Repurchases of common shares (in shares)					(6,500,000)
Repurchases of common shares	(51,939)			(51,939)	$ (65)		(43,738)		(8,136)
Equity compensation:
LTIP units	8,548									8,548
Restricted stock, net of forfeitures (in shares)					2,000
Restricted stock, net of forfeitures	231			231			231
Dividends and distributions	(31,668)			(18,194)					(18,194)	(12,427)	(1,047)
Net income (loss)	(19,618)			(12,793)					(12,793)	(7,872)	1,047
Other comprehensive income (loss)	608			377				377		231
Ending balance (in shares) at Jun. 30, 2020					172,333,000	1,014,000
Ending 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
Beginning balance (in shares) at Dec. 31, 2020		170,555,000	1,010,000		170,555,000	1,010,000
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)					2,149,000	(9,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			6,835	$ 21		6,841	(27)		(6,835)
Repurchases of common shares (in shares)					(383,000)
Repurchases of common shares	(3,533)			(3,533)	$ (4)		(2,551)		(978)
Equity compensation:
LTIP units	9,874									9,874
Restricted stock, net of forfeitures (in shares)					78,000
Restricted stock, net of forfeitures	164			164	$ 2		162
Dividends and distributions	(11,555)			(6,063)					(6,063)	(3,391)	(2,101)
Net income (loss)	1,220			(546)					(546)	(335)	2,101
Other comprehensive income (loss)	5,731			3,553				3,553		2,178
Ending balance (in shares) at Jun. 30, 2021		172,399,000	1,001,000		172,399,000	1,001,000
Ending 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
Beginning balance (in shares) at Mar. 31, 2021					171,327,000	1,005,000
Beginning balance at Mar. 31, 2021	1,731,195			1,053,495	$ 1,713	$ 10	1,147,588	(26,544)	(69,272)	647,760	29,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)					1,078,000	(4,000)
Conversion of operating partnership units and Class B shares to Class A shares	$ 0			4,173	$ 10		4,152	11		(4,173)
Repurchases of common shares (in shares)	0
Repurchases of common shares	$ 0
Equity compensation:
LTIP units	5,064									5,064
Restricted stock, net of forfeitures (in shares)					(6,000)
Restricted stock, net of forfeitures	240			240	$ 1		239
Dividends and distributions	(10,505)			(6,063)					(6,063)	(3,391)	(1,051)
Net income (loss)	4,411			2,075					2,075	1,285	1,051
Other comprehensive income (loss)	2,803			1,739				1,739		1,064
Ending balance (in shares) at Jun. 30, 2021		172,399,000	1,001,000		172,399,000	1,001,000
Ending 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