Intangible Assets and Intangible Liabilities - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible assets:
Gross amount	$ 686,284	$ 689,894
Accumulated amortization	(103,158)	(20,509)
Intangible assets, Net	583,126	669,385
Intangible liabilities:
Gross amount	222,903	222,985
Accumulated amortization	(21,064)	(3,757)
Intangible Liabilities, Net	$ 201,839	$ 219,228