Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Intangible assets:
Gross amount	$ 663,367	$ 689,894
Accumulated amortization	(116,935)	(20,509)
Intangible assets, Net	546,432	669,385
Intangible liabilities:
Gross amount	222,772	222,985
Accumulated amortization	(29,730)	(3,757)
Intangible Liabilities, Net	$ 193,042	$ 219,228