Organization and Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidation Policy

The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, and all of our wholly-owned and controlled subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements.

As of March 31, 2012 the consolidated financial statements of the Company and the Operating Partnership also include one variable interest entity ("VIE") in which we are deemed to be the primary beneficiary.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

In February 2012, we acquired seven office buildings in one transaction which were transferred to a special purpose VIE to facilitate a potential like−kind exchange pursuant to Section 1031 of the Code to defer taxable gains on sales for federal and state income tax purposes ("Section 1031 Exchange"). The Company is obligated to complete a Section 1031 Exchange, if any, and take title to the property within 180 days of the acquisition date. The VIE will be terminated upon the completion of the Section 1031 Exchange.

Reclassifications [Text Block]

Certain prior period amounts in the consolidated statements of cash flows of the Company and the Operating Partnership have been reclassified to conform to the current period presentation. We reclassified cash flow changes from "Marketable securities," "Current receivables," "Other deferred leasing costs" and "Prepaid expenses and other assets" into "Net change in other operating assets" for all periods presented. We also reclassified cash flow changes from "Accounts payable, accrued expenses and other liabilities," "Deferred revenue" and "Rents received in advance and tenant security deposits" into "Net change in other operating liabilities" for all periods presented. Each category change had previously been presented separately.