Other Assets (Details) ft² in Thousands, $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	May. 31, 2014 USD ($) ft² building
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid assets	$ 63,594	$ 61,403
Straight-line rent receivables	60,368	52,628
Above-market intangible assets, net	17,325	17,258
Additional long-lived assets, net	14,848	14,371
Ground lease modification, net	11,242	11,697
Accounts receivable	8,818	8,746
Allowance for uncollectible accounts	(179)	(465)
Deferred financing costs, net	8,698	9,856
Goodwill	3,487	3,487
Customer relationship intangible assets, net	1,866	1,934
Other	2,851	4,422
Other Assets	$ 192,918	$ 185,337
Other Assets (Textual) [Abstract]
Number of properties subject to ground lease modification | building			5
Ground lease modifications, square footage | ft²			424
Ground lease modification payments			$ 12,000