Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
REAL ESTATE ASSETS:
Land and improvements	$ 1,108,971	$ 1,108,971
Buildings and improvements	4,983,638	4,938,250
Undeveloped land and construction in progress	1,183,618	1,013,533
Total real estate assets held for investment	7,276,227	7,060,754
Accumulated depreciation and amortization	(1,234,079)	(1,139,853)
Total real estate assets held for investment, net	6,042,148	5,920,901
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET	0	9,417
CASH AND CASH EQUIVALENTS	387,616	193,418
RESTRICTED CASH	8,249	56,711
MARKETABLE SECURITIES (Note 11)	16,010	14,773
CURRENT RECEIVABLES, NET (Note 3)	13,703	13,460
DEFERRED RENT RECEIVABLES, NET (Note 3)	233,427	218,977
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	195,320	208,368
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 4)	98,894	70,608
TOTAL ASSETS	6,995,367	6,706,633
LIABILITIES:
Secured debt, net (Notes 5 and 11)	467,758	472,772
Unsecured debt, net (Notes 5 and 11)	2,097,083	1,847,351
Accounts payable, accrued expenses and other liabilities	219,483	202,391
Accrued dividends and distributions (Note 16)	44,105	222,306
Deferred revenue and acquisition-related intangible liabilities, net	148,729	150,360
Rents received in advance and tenant security deposits	55,738	52,080
Liabilities of real estate assets held for sale	0	56
Total liabilities	3,032,896	2,947,316
COMMITMENTS AND CONTINGENCIES (Note 10)
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Common stock, $.01 par value, 150,000,000 shares authorized, 98,351,217 and 93,219,439 shares issued and outstanding, respectively	984	932
Additional paid-in capital	3,792,028	3,457,649
Distributions in excess of earnings	(132,799)	(107,997)
Total stockholders’ equity	3,756,469	3,542,995
Noncontrolling Interests:
Common units of the Operating Partnership (Note 6)	77,296	85,590
Noncontrolling interests in consolidated property partnerships (Note 1)	128,706	130,732
Total noncontrolling interests	206,002	216,322
Total equity	3,962,471	3,759,317
TOTAL LIABILITIES AND EQUITY (CAPITAL)	6,995,367	6,706,633
6.875% Series G Cumulative Redeemable Preferred stock, $.01 par value, no shares issued and outstanding at 6/30/2017, and 4,000,000 shares authorized, issued and outstanding ($100,000 liquidation preference) at 12/31/2016 [Member]
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	0	96,155
6.375% Series H Cumulative Redeemable Preferred stock, $.01 par value, 4,000,000 shares authorized, issued and outstanding ($100,000 liquidation preference) (Note 16) [Member]
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	$ 96,256	$ 96,256