Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 152,378	$ 21,518
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	148,878	148,982
Increase in provision for bad debts	58	196
Depreciation of furniture, fixtures and equipment	1,731	1,363
Noncash amortization of share-based compensation awards	8,817	6,454
Noncash amortization of deferred financing costs and debt discounts and premiums	3,563	4,047
Noncash amortization of net below market rents (Note 3)	(6,216)	(6,015)
Gains on dispositions of discontinued operations (Note 13)	(110,391)	(423)
Gain on sale of land (Note 13)	(3,490)	0
Noncash amortization of deferred revenue related to tenant-funded tenant improvements	(7,695)	(7,585)
Straight-line rents	(15,245)	(18,188)
Net change in other operating assets	(795)	(6,435)
Net change in other operating liabilities	25,671	42,844
Insurance proceeds received for property damage	0	(448)
Net cash provided by operating activities	197,264	186,310
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of operating properties (Note 2)	(106,125)	(202,682)
Expenditures for operating properties	(93,977)	(83,991)
Expenditures for development and redevelopment properties and undeveloped land	(292,803)	(222,192)
Expenditures for acquisition of development and redevelopment properties (Note 2)	(97,727)	(13,269)
Net proceeds received from dispositions of operating properties and land (Note 13)	368,381	14,409
Insurance proceeds received from property damage	0	448
Decrease (increase) in acquisition-related deposits	1,000	(4,000)
Decrease in restricted cash (Notes 1 and 13)	32,293	229,613
Net cash used in investing activities	(188,958)	(281,664)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 7)	22,136	349,951
Borrowings on unsecured line of credit	365,000	10,000
Repayments on unsecured line of credit	(410,000)	(195,000)
Principal payments on secured debt	(7,315)	(91,298)
Proceeds from the issuance of unsecured debt (Note 5)	395,528	299,901
Repayments of unsecured debt (Note 5)	(83,000)	0
Repayments for early redemption of exchangeable senior notes (Note 5)	37,092	0
Financing costs	(8,043)	(3,975)
Repurchase of common stock and restricted stock units	(2,861)	(1,813)
Proceeds from exercise of stock options (Note 9)	20,537	128
Contributions from noncontrolling interests in consolidated subsidiary	336	0
Dividends and distributions paid to common stockholders and common unitholders	(88,540)	(82,152)
Dividends and distributions paid to preferred stockholders and preferred unitholders	(9,938)	(9,938)
Net cash provided by financing activities	156,748	275,804
Net increase in cash and cash equivalents	165,054	180,450
Cash and cash equivalents, beginning of period	35,377	16,700
Cash and cash equivalents, end of period	200,431	197,150
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $33,533 and $23,573 as of September 30, 2014 and 2013, respectively	42,633	47,107
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	92,693	79,866
Tenant improvements funded directly by tenants	23,069	5,750
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net	2,300	422
Contribution of land, net of related liabilities, by noncontrolling interest to consolidated subsidiary	0	4,885
Assumption of secured debt in connection with property acquisitions	0	95,496
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders	30,258	29,378
Accrual of dividends and distributions payable to preferred stockholders and preferred unitholders	1,656	1,692
Fair value of share-based compensation awards at equity classification date (Note 9)	18,111	10,347
Exchange of common units of the Operating Partnership into shares of the Company’s common stock	$ 28	$ 0