Intangible Assets and Liabilities - Annual Amortization of Intangible Assets, Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
2016 (nine months remaining)	$ 26,791
2017	20,012
2018	11,853
2019	10,609
2020	8,513
Thereafter	22,285
Intangible Assets, net	100,063	$ 111,623
Liabilities
2016 (nine months remaining)	5,092
2017	3,356
2018	2,201
2019	1,885
2020	1,337
Thereafter	9,377
Acquired Lease Intangibles, Net	$ 23,248	$ 25,655