Goodwill and Other Intangibles (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Acquired Finite Lived Intangible Assets Liabilities
Acquired finite-lived intangible asset, acquisition	$ 100,674
Below-market rent
Acquired Finite Lived Intangible Assets Liabilities
Acquired finite lived intangible liabilities weighted average useful life	21 years 1 month 7 days
Acquired finite-lived intangible liability, acquisition	(32,716)
In-place lease
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	12 years 3 months 20 days
Acquired finite-lived intangible asset, acquisition	85,759
Above-market rent
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	16 years 6 months
Acquired finite-lived intangible asset, acquisition	10,917
Below-market ground lease
Acquired Finite Lived Intangible Assets Liabilities
Acquired intangible assets weighted-average life	118 years 1 month 7 days
Acquired finite-lived intangible asset, acquisition	$ 3,998