Collaborative Arrangements and Acquisitions - Aggregate VIE Financial Information, Schedule of collaborative arrangement summary of items related to VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Restricted cash and cash equivalents (VIE)	$ 8,143	$ 1,489	$ 1,803	$ 47,762
Intangible assets	29,000	29,000
Noncontrolling interest	28,365	13,727
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Restricted cash and cash equivalents (VIE)	8,143	1,489
Intangible assets	29,000	29,000
Deferred tax liability	9,414	4,756
Noncontrolling interest	$ 28,365	$ 13,727

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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