Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Intangible assets:
Gross amount	$ 567,142	$ 655,194
Accumulated amortization	(160,956)	(143,987)
Intangible assets, Net	406,186	511,207
Intangible liabilities:
Gross amount	199,416	221,672
Accumulated amortization	(55,219)	(41,931)
Intangible Liabilities, Net	$ 144,197	$ 179,741