Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets
Deferred leasing costs	$ 34,142	$ 27,229
Deferred rent receivable	29,309	21,510
Corporate furniture, fixtures and equipment	6,157	7,474
Internal-use software	10,467	7,980
Deferred financing costs	2,251	1,600
Prepaid expense	2,689	6,251
Other	1,618	2,735
Total	86,633	74,779
Estimated amortization of deferred leasing costs
2016	12,500
2017	9,590
2018	5,217
2019	1,753
2020	1,183
Thereafter	3,899
Total	$ 34,142	$ 27,229