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Equity Method Investments (Details) - USD ($) $ in Thousands				12 Months Ended
	Feb. 07, 2018	Jul. 24, 2017	Jul. 25, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Ownership			17.00%
Payments to acquire			$ 46,700	$ 5,000	$ 12,764	$ 46,745
Equity method investment				45,913	54,606
Net revenues				1,966,492	1,473,413	1,079,874
Loan repayment from equity investee				30,000	6,000	$ 0
SDC
Schedule of Equity Method Investments [Line Items]
Additional ownership acquired		2.00%
Payments to acquire		$ 12,800
Equity method investment				45,900	54,600
Due from related parties				16,300	14,300
Net revenues				$ 27,900	$ 24,100
Loan agreement reached		$ 30,000
Loan repayment from equity investee	$ 30,000

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