Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 25,008us-gaap_ProfitLoss	$ 40,749us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	58,920	50,421
Impairment of Real Estate	14,510us-gaap_ImpairmentOfRealEstate	0us-gaap_ImpairmentOfRealEstate
Equity in earnings of affiliates	(574)	0
Distributions of earnings from unconsolidated joint ventures	491	0
Amortization of loan fees and costs	2,834us-gaap_AmortizationOfFinancingCosts	2,561us-gaap_AmortizationOfFinancingCosts
Amortization of debt premiums/discounts	(82)	205
Amortization of above and below Market Leases	(933)	(816)
Deferred rent	(9,901)us-gaap_StraightLineRent	(11,882)us-gaap_StraightLineRent
Stock compensation expense	3,690us-gaap_ShareBasedCompensation	3,228us-gaap_ShareBasedCompensation
Investment gains	(5,937)us-gaap_GainOnSaleOfInvestments	(4,040)us-gaap_GainOnSaleOfInvestments
Investment losses	2,225us-gaap_LossOnSaleOfInvestments	1,694us-gaap_LossOnSaleOfInvestments
Changes in operating assets and liabilities:
Restricted cash	(51)	0
Tenant receivables	(102)	(690)
Deferred leasing costs	(7,131)	(7,572)
Other assets	(3,247)	(17,315)
Accounts payable, accrued expenses, and tenant security deposits	27,121	16,716
Net cash (used in) provided by operating activities	106,841	73,259
Investing Activities
Proceeds from sale of properties	67,616	0
Additions to real estate	(104,632)	(111,587)
Purchase of real estate	(93,938)us-gaap_PaymentsToAcquireRealEstate	(42,338)us-gaap_PaymentsToAcquireRealEstate
Deposits for investing activities	(28,000)	0
Change in restricted cash related to construction projects	0	(140)
Contributions to unconsolidated real estate entity	(2,539)	(747)
Additions to investments	(15,118)us-gaap_PaymentsToAcquireInvestments	(11,905)us-gaap_PaymentsToAcquireInvestments
Sales of investments	2,345	3,998
Repayment of notes receivable	4,214	0
Net cash (used in) provided by investing activities	(170,052)	(162,719)
Financing Activities
Borrowings from secured notes payable	29,585	51,030
Repayments of borrowings from secured notes payable	(7,934)us-gaap_RepaymentsOfSecuredDebt	(210,844)us-gaap_RepaymentsOfSecuredDebt
Principal borrowings from unsecured senior line of credit	167,000	360,000
Repayments of borrowings from unsecured senior line of credit	(50,000)	(58,000)
Change in restricted cash related to financings	(1,369)	1,059
Deferred financing costs paid	(563)us-gaap_PaymentsOfFinancingCosts	(8)us-gaap_PaymentsOfFinancingCosts
Dividends paid on common stock	(53,295)us-gaap_PaymentsOfDividendsCommonStock	(48,714)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid on preferred stock	(6,247)	(6,471)
Proceeds from Noncontrolling Interests	340	19,410
Distributions to noncontrolling interests	(9,846)us-gaap_PaymentsToMinorityShareholders	(988)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	67,671	106,474
Effect of foreign exchange rate changes on cash and cash equivalents	170	260
Net increase (decrease) in cash and cash equivalents	4,630	17,274
Cash and cash equivalents at beginning of period	86,011	57,696
Cash and cash equivalents at end of period	90,641	74,970
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	15,514us-gaap_InterestPaidNet	6,093us-gaap_InterestPaidNet
Non-Cash Investing Activities
Change in accrued construction	7,249	6,028
Assumption of secured notes payable in connection with purchase of properties	(82,000)us-gaap_NotesAssumed1	(48,329)us-gaap_NotesAssumed1
Payable for purchase of noncontrolling interest	$ (113,967)	$ 0

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The cash outflow for loan and debt issuance costs.

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-Glossary Financing Activities

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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-Publisher FASB

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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-Glossary Financing Activities

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Difference between actual rental income due and rental income recognized on a straight-line basis.

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