Intangible Asset, Net - Related Party (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 129,705,000			$ 129,705,000
Accumulated amortization	(25,052,000)			(2,112,000)
Net book value	104,653,000		$ 108,373,000	127,593,000
Amortization expense	3,700,000	$ 0
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accumulated amortization	$ 25,052,000			$ 2,112,000
Adjustments due to ASU No. 2014-09
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization			(19,200,000)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accumulated amortization			$ 19,200,000