Goodwill and Other Intangibles (Details 1) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Acquired Finite Lived Intangible Assets Liabilities
Acquired finite-lived intangible asset, acquisition	$ 106,928
Below-market rent
Acquired Finite Lived Intangible Assets Liabilities
Acquired finite lived intangible liabilities weighted average useful life	14 years 7 months 6 days
Acquired finite-lived intangible liability, acquisition	$ (6,492)
In-place lease
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	12 years 10 months 24 days
Acquired finite-lived intangible asset, acquisition	$ 70,411
Above-market rent
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	15 years 1 month 6 days
Acquired finite-lived intangible asset, acquisition	$ 29,554
Below-market ground lease
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	73 years 4 months 24 days
Acquired finite-lived intangible asset, acquisition	$ 6,963