Intangible Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Acquired Intangible Assets Liabilities
Amortizable Intangible Assets	$ 87,065
Goodwill	4,062
Intangible assets acquired	91,127
Amortizable Intangible Liabilities	(25,922)
Below-market rent
Acquired Intangible Assets Liabilities
Weighted-average useful life, intangible liabilities	19 years 3 months 18 days
Amortizable Intangible Liabilities	(25,765)
Above-market ground lease
Acquired Intangible Assets Liabilities
Weighted-average useful life, intangible liabilities	48 years 7 months 6 days
Amortizable Intangible Liabilities	(157)
In-place lease
Acquired Intangible Assets Liabilities
Weighted average useful life, intangible assets	17 years 6 months
Amortizable Intangible Assets	61,081
Above-market rent
Acquired Intangible Assets Liabilities
Weighted average useful life, intangible assets	16 years 7 months 6 days
Amortizable Intangible Assets	20,270
Below-market ground lease
Acquired Intangible Assets Liabilities
Weighted average useful life, intangible assets	54 years 7 months 6 days
Amortizable Intangible Assets	$ 5,714