Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Intangible assets:
Gross amount	$ 579,066	$ 655,194
Accumulated amortization	(166,841)	(143,987)
Intangible assets, Net	412,225	511,207
Intangible liabilities:
Gross amount	208,367	221,672
Accumulated amortization	(55,349)	(41,931)
Intangible Liabilities, Net	$ 153,018	$ 179,741