CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Previously Reported [Member]	Restatement Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Additional Paid in Capital [Member]	Additional Paid in Capital [Member] Previously Reported [Member]	Earnings Less than Distributions [Member]	Earnings Less than Distributions [Member] Previously Reported [Member]	Earnings Less than Distributions [Member] Restatement Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Joint Ventures [Member]	Noncontrolling Interest [Member] Consolidated Joint Ventures [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member] Restatement Adjustment [Member]	Noncontrolling Interest [Member] Operating Partnership [Member]	Noncontrolling Interest [Member] Operating Partnership [Member] Previously Reported [Member]
Beginning balance at Dec. 31, 2016	$ 4,885,947			$ 2,300		$ 4,116,987		$ (129,654)			$ 372		$ 253,788		$ 64,793			$ 577,361
Common stock, shares outstanding at Dec. 31, 2016				230,015,000
Net income (loss)	107,176							86,381					(10,365)		19,797			11,363
Common shares issued upon redemption of common units				$ 103		172,625
Common shares issued upon redemption of common units				10,359,000
Redemption of minority interest in operating partnerships																		(172,728)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(154)							(154)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				53,000
Dividends and distributions	(100,840)							(90,266)										(10,574)
Contributions from noncontrolling interests	100,777												96,472		4,305
Distributions to noncontrolling interests	(119,251)												(44,905)		(74,346)
Consolidation of 300 Mission Street	110,007												110,007
Change in value of interest rate swaps	10,618										9,559							1,059
Pro rata share of other comprehensive income (loss) of unconsolidated joint ventures	160										152							8
Amortization of equity awards	18,790					3,085												15,705
Other	8,854					5,251												3,603
Ending balance at Dec. 31, 2017		$ 5,022,084			$ 2,403		$ 4,297,948		$ (133,693)			$ 10,083		$ 404,997		$ 14,549			$ 425,797
Ending balance (Basis adjustment upon adoption of ASU 2017-05) at Dec. 31, 2017			$ 7,086							$ 529							$ 6,557
Common stock, shares outstanding at Dec. 31, 2017				240,427,000	240,427,000
Balance as of January 1, 2018	5,029,170			$ 2,403		4,297,948		(133,164)			10,083		404,997		21,106			425,797
Net income (loss)	18,993							9,147					8,182		720			944
Common shares issued upon redemption of common units				$ 2		3,459
Common shares issued upon redemption of common units				203,000
Redemption of minority interest in operating partnerships																		(3,461)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(213)							(213)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				61,000
Repurchases of common shares	$ (105,383)			$ (76)		(105,307)
Repurchases of common shares, shares	(7,555,601)			(7,555,000)
Dividends and distributions	$ (105,746)							(95,506)										(10,240)
Contributions from noncontrolling interests	45,116														45,116
Distributions to noncontrolling interests	(18,184)												(18,184)
Change in value of interest rate swaps	7,273										6,605							668
Pro rata share of other comprehensive income (loss) of unconsolidated joint ventures	(129)										(67)				(55)			(7)
Amortization of equity awards	20,937					2,943												17,994
Other	(170)					2,713		(170)										(2,713)
Ending balance at Dec. 31, 2018	$ 4,891,664			$ 2,329		4,201,756		(219,906)			16,621		394,995		66,887			428,982
Common stock, shares outstanding at Dec. 31, 2018	233,135,704			233,136,000
Net income (loss)	$ (29,603)							(36,899)					11,022		313			(4,039)
Common shares issued upon redemption of common units				$ 14		24,016
Common shares issued upon redemption of common units				1,409,000
Redemption of minority interest in operating partnerships																		(24,030)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(324)			$ 3				(327)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				46,000
Repurchases of common shares	$ (94,617)			$ (72)		(94,545)
Repurchases of common shares, shares	(7,158,804)			(7,159,000)
Dividends and distributions	$ (102,464)							(92,425)										(10,039)
Contributions from noncontrolling interests	14,989														14,989
Distributions to noncontrolling interests	(45,239)												(45,239)
Change in value of interest rate swaps	(28,069)										(25,367)							(2,702)
Settlement of interest rate swap liabilities	11,258										8,431							2,827
Pro rata share of other comprehensive income (loss) of unconsolidated joint ventures	206										144				47			15
Amortization of equity awards	23,001					2,564												20,437
Acquisition of noncontrolling interest	(9,840)														(9,840)
Other						(607)												607
Ending balance at Dec. 31, 2019	$ 4,630,962			$ 2,274		$ 4,133,184		$ (349,557)			$ (171)		$ 360,778		$ 72,396			$ 412,058
Common stock, shares outstanding at Dec. 31, 2019	227,432,030			227,432,000