Condensed Consolidated Statements of Stockholders' Equity (unaudited) - 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)				3,063,000	(8,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 31		8,865	(38)		8,858	(8,858)
Equity compensation:
LTIP units	11,515									11,515
Restricted stock, net of forfeitures (in shares)				54,000
Restricted stock, net of forfeitures	230					230			230
Dividends and distributions	(64,190)							(37,191)	(37,191)	(26,531)	(468)
Net income (loss)	28,786							16,764	16,764	11,554	468
Other comprehensive income (loss)	(19,418)						(11,496)		(11,496)	(7,922)
Ending balance (in shares) at Jun. 30, 2019				176,991,000	1,030,000
Ending 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
Beginning balance (in shares) at Mar. 31, 2019				175,558,000	1,035,000
Beginning balance at Mar. 31, 2019	1,967,201			$ 1,755	$ 10	1,207,386	(13,130)	28,668	1,224,689	734,508	8,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of operating partnership units and Class B shares to Class A shares (in shares)				1,438,000	(5,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 15		5,594	(33)		5,576	(5,576)
Equity compensation:
LTIP units	6,136									6,136
Restricted stock, net of forfeitures (in shares)				(5,000)
Restricted stock, net of forfeitures	190					190			190
Dividends and distributions	(32,248)							(18,671)	(18,671)	(13,343)	(234)
Net income (loss)	18,930							11,087	11,087	7,609	234
Other comprehensive income (loss)	(12,177)						(7,224)		(7,224)	(4,953)
Ending balance (in shares) at Jun. 30, 2019				176,991,000	1,030,000
Ending 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
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)				4,378,000	(3,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 44		21,734	(261)		21,517	(21,517)
Repurchases of common shares (in shares)				(13,071,000)
Repurchases of common shares	(114,605)			$ (130)		(88,101)		(26,374)	(114,605)
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		172,332,358	1,014,221	172,333,000	1,014,000
Ending 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
Beginning balance (in shares) at Mar. 31, 2020				176,113,000	1,015,000
Beginning balance at Mar. 31, 2020	1,849,876			$ 1,761	$ 10	1,195,885	(32,106)	(16,966)	1,148,584	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			$ 27		14,073	(145)		13,955	(13,955)
Repurchases of common shares (in shares)				(6,500,000)
Repurchases of common shares	(51,939)			$ (65)		(43,738)		(8,136)	(51,939)
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		172,332,358	1,014,221	172,333,000	1,014,000
Ending 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