Intangible Assets and Liabilities - Annual Amortization of Intangible Assets, Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
2019	$ 41,968
2020	28,393
2021	20,128
2022	12,791
2023	9,756
Thereafter	18,312
Intangible Assets, net	131,348	$ 64,972
Liabilities
2019	7,403
2020	5,707
2021	4,302
2022	2,654
2023	2,094
Thereafter	9,623
Acquired Lease Intangibles, Net	$ 31,783	$ 20,274