CONSOLIDATED STATEMENTS OF EQUITY - USD ($)	Total	Common Shares	Common Shares Class A Common Shares	Common Shares Class B Common Shares	Preferred Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Net Income	Total Shareholders' Equity	Noncontrolling Interests Common Units And LTIP Units	Total Equity	Consolidated Joint Ventures
Balance at Dec. 31, 2018			$ 395,000	$ 0	$ 147,000	$ 1,155,776,000	$ 4,227,000	$ (267,740,000)	$ 892,805,000	$ 62,010,000	$ 954,815,000	$ 2,708,000
Balance (in shares) at Dec. 31, 2018		39,458,626			14,703,214					3,749,665
Increase (Decrease) in Stockholders' Equity
Repurchase of Common Shares			(10,000)			(14,255,000)			(14,265,000)		(14,265,000)
Repurchase of Common Shares (in shares)		(933,436)
Issuance Costs						(21,000)			(21,000)		(21,000)
Dividends and Distributions declared:
Common Shares								(32,777,000)	(32,777,000)		(32,777,000)
Preferred Stock								(18,131,000)	(18,131,000)		(18,131,000)
Common Units										$ (1,736,000)	(1,736,000)
LTIP Units										$ (1,982,000)	(1,982,000)
Stock Issued During Period, Value, Dividend Reinvestment Plan	$ 48,000					48,000			48,000		48,000
Dividend Reinvestment Plan (in shares)		2,885
Share-based Payment Arrangement, Noncash Expense [Abstract]
Grants			1,000			400,000			401,000		401,000
Grants (in shares)		81,827								530,281
Amortization						2,304,000			2,304,000	$ 8,266,000	10,570,000
Equity Contribution to Consolidated Joint Venture												300,000
Change in Fair Value of Derivative Instruments	(9,276,000)						(8,543,000)		(8,543,000)	(733,000)	(9,276,000)
Adjustment to Record Noncontrolling Interest at Redemption Value						(488,000)			(488,000)		(488,000)	488,000
Net Income (Loss)	(1,816,000)							38,000	38,000	(1,554,000)	(1,516,000)	(300,000)
Balance at Sep. 30, 2019			386,000	0	$ 147,000	1,143,764,000	(4,316,000)	(318,610,000)	821,371,000	$ 64,271,000	885,642,000	3,196,000
Balance (in shares) at Sep. 30, 2019		38,609,902			14,703,214					4,279,946
Balance at Jun. 30, 2019			393,000	0	$ 147,000	1,152,939,000	(3,285,000)	(302,705,000)	847,489,000	$ 64,574,000	912,063,000	2,856,000
Balance (in shares) at Jun. 30, 2019		39,240,924			14,703,214					4,279,946
Increase (Decrease) in Stockholders' Equity
Repurchase of Common Shares			(7,000)			(9,563,000)			(9,570,000)		(9,570,000)
Repurchase of Common Shares (in shares)		(659,898)
Dividends and Distributions declared:
Common Shares								(10,810,000)	(10,810,000)		(10,810,000)
Preferred Stock								(6,044,000)	(6,044,000)		(6,044,000)
Common Units										$ (579,000)	(579,000)
LTIP Units										(619,000)	(619,000)
Stock Issued During Period, Value, Dividend Reinvestment Plan						6,000			6,000		6,000
Dividend Reinvestment Plan (in shares)		389
Share-based Payment Arrangement, Noncash Expense [Abstract]
Grants (in shares)		28,487
Amortization						722,000			722,000	1,427,000	2,149,000
Change in Fair Value of Derivative Instruments	(1,121,000)						(1,031,000)		(1,031,000)	(90,000)	(1,121,000)
Adjustment to Record Noncontrolling Interest at Redemption Value						(340,000)			(340,000)		(340,000)	340,000
Net Income (Loss)	507,000							949,000	949,000	(442,000)	507,000
Balance at Sep. 30, 2019			386,000	0	$ 147,000	1,143,764,000	(4,316,000)	(318,610,000)	821,371,000	$ 64,271,000	885,642,000	3,196,000
Balance (in shares) at Sep. 30, 2019		38,609,902			14,703,214					4,279,946
Balance at Dec. 31, 2019	871,801,000		387,000	0	$ 147,000	1,144,808,000	1,010,000	(338,695,000)	807,657,000	$ 64,144,000	871,801,000	3,196,000
Balance (in shares) at Dec. 31, 2019		38,652,650			14,703,214					4,279,946
Increase (Decrease) in Stockholders' Equity
Issuance Costs						(30,000)			(30,000)		(30,000)
Dividends and Distributions declared:
Preferred Stock								(1,007,000)	(1,007,000)		(1,007,000)
Stock Issued During Period, Value, Dividend Reinvestment Plan	14,000					14,000			14,000		14,000
Dividend Reinvestment Plan (in shares)		1,094
Share-based Payment Arrangement, Noncash Expense [Abstract]
Grants			2,000						2,000		2,000
Grants (in shares)		189,738								1,112,862
Amortization						2,069,000			2,069,000	$ 5,635,000	7,704,000
Change in Fair Value of Derivative Instruments	(26,164,000)						(23,757,000)		(23,757,000)	(2,407,000)	(26,164,000)
Adjustment to Record Noncontrolling Interest at Redemption Value						3,196,000			3,196,000		3,196,000	(3,196,000)
Net Income (Loss)	(145,925,000)							(130,832,000)	(130,832,000)	(15,093,000)	(145,925,000)
Balance at Sep. 30, 2020	709,591,000		389,000	0	$ 147,000	1,150,057,000	(22,747,000)	(470,534,000)	657,312,000	$ 52,279,000	709,591,000	0
Balance (in shares) at Sep. 30, 2020		38,843,482			14,703,214					5,392,808
Balance at Jun. 30, 2020			$ 388,000	0	$ 147,000	1,149,291,000	(27,097,000)	(427,393,000)	695,336,000	$ 55,715,000	751,051,000	0
Balance (in shares) at Jun. 30, 2020		38,789,371			14,703,214					5,381,870
Share-based Payment Arrangement, Noncash Expense [Abstract]
Grants		$ 54,111							1,000		1,000
Grants (in shares)			1,000							10,938
Amortization						766,000			766,000	$ 1,168,000	1,934,000
Change in Fair Value of Derivative Instruments	4,776,000						4,350,000		4,350,000	428,000	4,778,000
Net Income (Loss)	(48,173,000)							(43,141,000)	(43,141,000)	(5,032,000)	(48,173,000)
Balance at Sep. 30, 2020	$ 709,591,000		$ 389,000	$ 0	$ 147,000	$ 1,150,057,000	$ (22,747,000)	$ (470,534,000)	$ 657,312,000	$ 52,279,000	$ 709,591,000	$ 0
Balance (in shares) at Sep. 30, 2020		38,843,482			14,703,214					5,392,808