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)				1,625,000	(3,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 16		3,271	(5)		3,282	(3,282)
Equity compensation:
LTIP units	5,379									5,379
Restricted stock, net of forfeitures (in shares)				59,000
Restricted stock, net of forfeitures	40					40			40
Dividends and distributions	(31,942)							(18,520)	(18,520)	(13,188)	(234)
Net income	9,856							5,677	5,677	3,945	234
Other comprehensive income (loss)	(7,241)						(4,272)		(4,272)	(2,969)
Ending balance (in shares) at Mar. 31, 2019				175,558,000	1,035,000
Ending 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
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)				1,660,000	(2,000)
Conversion of operating partnership units and Class B shares to Class A shares	0			$ 17		7,661	(116)		7,562	(7,562)
Repurchases of common shares (in shares)				(6,571,000)
Repurchases of common shares	(62,666)			$ (65)		(44,363)		(18,238)	(62,666)
Equity compensation:
LTIP units	5,737									5,737
Restricted stock, net of forfeitures (in shares)				146,000
Restricted stock, net of forfeitures	154					154			154
Dividends and distributions	(32,651)							(18,987)	(18,987)	(12,614)	(1,050)
Net income	8,288							4,495	4,495	2,743	1,050
Other comprehensive income (loss)	(16,899)						(10,494)		(10,494)	(6,405)
Ending balance (in shares) at Mar. 31, 2020		176,112,860	1,015,149	176,113,000	1,015,000
Ending 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