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Acquisitions Acquisitions - Schedule of allocation of the purchase price for assets and liabilities acquired (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 15, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 15, 2014
Business Combinations [Abstract] |  |  |  |
Cash and issuance of Series PR OP units | $ 565,916 |  |  |
Debt assumed | 167,684 | 182,851 | 0 |
Total consideration paid | 733,600 |  |  |
Land and building and improvements |  |  |  | 356,206
Acquired below-market ground leases |  |  |  | 333,046
Acquired above-market leases |  |  |  | 13,048
Acquired in place lease value and deferred leasing costs |  |  |  | 88,080
Mortgage notes payable, inclusive of premium |  |  |  | (182,851)
Acquired below-market leases |  |  |  | (36,458)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities, Net of Other Assets |  |  |  | 5,155
Total net assets acquired |  |  |  | $ 565,916

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