Other Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing commissions, accumulative amortization	$ 20,659	$ 19,606
Lease incentives, accumulated amortization	2,960	2,590
Other intangible assets, accumulated amortization	1,590	1,554
Debt issuance costs, accumulated amortization	$ 4,147	$ 2,985