Intangible Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Amortizable Intangible Assets
Acquired finite lived intangible assets	$ 156,371
Amortizable Intangible Liability
Acquired finite-lived intangible liabilities	(4,856)
Below-market rent
Amortizable Intangible Liability
Acquired finite-lived intangible liabilities, weighted average useful life	16 years 2 months 12 days
Acquired finite-lived intangible liabilities	(4,723)
Above-market ground lease
Amortizable Intangible Liability
Acquired finite-lived intangible liabilities, weighted average useful life	81 years 1 month 6 days
Acquired finite-lived intangible liabilities	(133)
In-place lease
Amortizable Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life	11 years 4 months 24 days
Acquired finite lived intangible assets	135,679
Below-market ground lease
Amortizable Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life	13 years 8 months 12 days
Acquired finite lived intangible assets	11,067
Above market rent
Amortizable Intangible Assets
Acquired finite-lived intangible assets, weighted average useful life	74 years 10 months 24 days
Acquired finite lived intangible assets	$ 9,625