CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES:
Rental income	$ 169,529,000	$ 158,187,000	$ 332,934,000	$ 313,577,000
Tenant reimbursement income	13,164,000	11,856,000	27,410,000	24,708,000
Fee and other income	8,726,000	7,661,000	15,346,000	20,655,000
Total revenues	191,419,000	177,704,000	375,690,000	358,940,000
EXPENSES:
Operating	67,646,000	63,461,000	136,624,000	129,432,000
Depreciation and amortization	64,775,000	68,636,000	129,931,000	131,628,000
General and administrative	17,195,000	16,573,000	29,826,000	30,154,000
Transaction related costs	293,000	502,000	413,000	777,000
Real estate impairment loss	46,000,000		46,000,000
Total expenses	195,909,000	149,172,000	342,794,000	291,991,000
Operating (loss) income	(4,490,000)	28,532,000	32,896,000	66,949,000
Income from unconsolidated joint ventures	2,521,000	16,535,000	2,459,000	18,472,000
Loss from unconsolidated real estate funds	(14,000)	(2,411,000)	(80,000)	(2,123,000)
Interest and other income, net	2,094,000	2,486,000	4,110,000	5,686,000
Interest and debt expense	(36,809,000)	(34,817,000)	(72,891,000)	(71,835,000)
Loss on early extinguishment of debt		(5,162,000)		(7,877,000)
Gain on sale of real estate		133,989,000		133,989,000
Unrealized gain on interest rate swaps				1,802,000
Net (loss) income before income taxes	(36,698,000)	139,152,000	(33,506,000)	145,063,000
Income tax benefit (expense)	120,000	(970,000)	(357,000)	(5,252,000)
Net (loss) income	(36,578,000)	138,182,000	(33,863,000)	139,811,000
Less net (income) loss attributable to noncontrolling interests in:
Consolidated joint ventures	(1,752,000)	(1,897,000)	(2,807,000)	(3,188,000)
Consolidated real estate fund	(152,000)	(20,169,000)	(582,000)	(20,081,000)
Operating Partnership	3,666,000	(13,100,000)	3,550,000	(13,154,000)
Net (loss) income attributable to common stockholders	$ (34,816,000)	$ 103,016,000	$ (33,702,000)	$ 103,388,000
(LOSS) INCOME PER COMMON SHARE - BASIC:
(Loss) income per common share	$ (0.14)	$ 0.44	$ (0.14)	$ 0.44
Weighted average shares outstanding	240,336,485	234,990,468	240,324,183	232,968,602
(LOSS) INCOME PER COMMON SHARE - DILUTED:
(Loss) income per common share	$ (0.14)	$ 0.44	$ (0.14)	$ 0.44
Weighted average shares outstanding	240,336,485	235,010,830	240,324,183	232,995,822
DIVIDENDS PER COMMON SHARE	$ 0.10	$ 0.095	$ 0.20	$ 0.190