Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net income	$ 63,574	$ 58,416
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	93,575	95,760
Loss on early extinguishment of debt	560	2,225
Gain on sale of land parcel	(772)	(1,864)
Loss (gain) on sale of real estate	121	(2)
Amortization of loan fees and costs	4,813	4,857
Amortization of debt premiums/discounts	237	289
Amortization of acquired above and below market leases	(1,660)	(1,578)
Deferred rent	(14,437)	(13,991)
Stock compensation expense	7,812	6,567
Equity in loss related to investments	0	26
Gain on sales of investments	(2,666)	(11,126)
Loss on sales of investments	529	1,089
Changes in operating assets and liabilities:
Restricted cash	392	(610)
Tenant receivables	847	1,366
Deferred leasing costs	(23,109)	(13,791)
Other assets	5,043	(9,331)
Accounts payable, accrued expenses, and tenant security deposits	8,215	25,225
Net cash provided by operating activities	143,074	143,527
Investing Activities
Proceeds from sale of properties	101,815	1,905
Additions to properties	(298,927)	(259,480)
Purchase of properties	0	(42,171)
Change in restricted cash related to construction projects	(8,889)	(11,532)
Distribution from unconsolidated real estate entity	274	22,250
Contributions to unconsolidated real estate entity	(5,163)	(4,918)
Loss in investments from unconsolidated entity	(293)	0
Additions to investments	(14,833)	(16,344)
Proceeds from investments	9,544	17,559
Net cash used in investing activities	(216,472)	(292,731)
Financing Activities
Borrowings from secured notes payable	26,114	0
Repayments of borrowings from secured notes payable	(31,436)	(4,525)
Proceeds from issuance of unsecured senior notes payable	495,310	544,649
Principal borrowings from unsecured senior line of credit	305,000	529,147
Repayments of borrowings from unsecured senior line of credit	(871,000)	(520,147)
Repayment of unsecured senior bank term loan	(150,000)	(250,000)
Repurchase of unsecured senior convertible notes	0	(84,801)
Redemption of Series C Cumulative Redeemable Preferred Stock	0	(129,638)
Proceeds from issuance of Series E Cumulative Redeemable Preferred Stock	0	124,868
Change in restricted cash related to financings	16,634	(7,714)
Deferred financing costs paid	(1,457)	(15,739)
Proceeds from common stock offering	535,536	37,385
Proceeds from exercise of stock options	0	155
Dividends paid on common stock	(73,932)	(60,791)
Dividends paid on preferred stock	(12,942)	(14,178)
Distributions to redeemable noncontrolling interests	(596)	(630)
Contributions by noncontrolling interests	0	1,125
Distributions to noncontrolling interests	(639)	(598)
Net cash provided by financing activities	236,592	148,568
Effect of foreign exchange rate changes on cash and cash equivalents	(1,960)	3,034
Net increase (decrease) in cash and cash equivalents	161,234	2,398
Cash and cash equivalents at beginning of period	140,971	78,539
Cash and cash equivalents at end of period	302,205	80,937
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	29,259	22,693
Non-Cash Investing Activities
Note receivable from sale of real estate	38,820	0
Change in accrued capital expenditures	$ (48,198)	$ 4,370