Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities
Net income	$ (98,150)	$ 63,438
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	141,035	121,091
Loss on early extinguishment of debt	0	189
Impairment of real estate	185,123	14,510
Equity in losses (earnings) of unconsolidated real estate joint ventures	543	(1,115)
Distributions of earnings from unconsolidated real estate joint ventures	181	648
Amortization of loan fees	5,712	5,723
Amortization of debt premiums/discounts	(112)	(182)
Amortization of acquired below-market leases	(1,940)	(1,939)
Deferred rent	(14,568)	(23,193)
Stock compensation expense	11,556	7,744
Investment gains	(20,606)	(13,710)
Investment losses	6,821	7,877
Changes in operating assets and liabilities:
Restricted cash	232	110
Tenant receivables	1,277	1,243
Deferred leasing costs	(13,858)	(24,503)
Other assets	(5,931)	(4,921)
Accounts payable, accrued expenses, and tenant security deposits	(25,207)	(1,610)
Net cash provided by operating activities	172,108	151,400
Investing Activities
Proceeds from sale of properties	16,905	92,455
Additions to real estate	(363,061)	(226,302)
Purchase of real estate	0	(137,493)
Deposits for investing activities	(75)	(15,501)
Investments in unconsolidated real estate joint ventures	(5,946)	(3,182)
Additions to investments	(52,366)	(52,738)
Sales of investments	21,543	22,474
Repayment of notes receivable	9,036	4,247
Net cash used in investing activities	(373,964)	(316,040)
Financing Activities
Borrowings from secured notes payable	148,722	42,867
Repayments of borrowings from secured notes payable	(233,168)	(10,075)
Proceeds from issuance of unsecured senior notes payable	348,604	0
Borrowings from unsecured senior line of credit	1,486,000	915,000
Repayments of borrowings from unsecured senior line of credit	(1,565,000)	(595,000)
Repayment of unsecured senior bank term loan	0	(25,000)
Change in restricted cash related to financing activities	10,582	(1,520)
Payment of loan fees	(7,927)	(3,559)
Repurchase of Series D cumulative convertible preferred stock	(59,310)	0
Proceeds from the issuance of common stock	367,802	5,052
Dividends on common stock	(115,589)	(106,603)
Dividends on preferred stock	(12,086)	(12,493)
Financing costs paid for sales of noncontrolling interests	(8,093)	0
Contributions from and sale of noncontrolling interests	31,020	340
Distributions to and purchase of noncontrolling interests	(57,998)	(61,890)
Net cash provided by financing activities	333,559	147,119
Effect of foreign exchange rate changes on cash and cash equivalents	(801)	127
Net increase in cash and cash equivalents	130,902	(17,394)
Cash and cash equivalents at beginning of period	125,098	86,011
Cash and cash equivalents at end of period	256,000	68,617
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	37,656	44,332
Non-Cash Investing Activities
Change in accrued construction	59,871	(27,469)
Assumption of secured notes payable in connection with purchase of properties	0	(82,000)
Non-Cash Financing Activities:
Redemption of redeemable noncontrolling interests	(5,000)	0
Payable for purchase of noncontrolling interest	$ 0	$ (52,672)