Equity Method Investments (Details) - USD ($) $ in Thousands					12 Months Ended
		Feb. 07, 2018	Jul. 24, 2017	Jul. 25, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Ownership				17.00%
Payments to acquire				$ 46,700	$ 12,764	$ 46,745	$ 0
Equity method investment					54,606	45,061
Net revenues	[1]				1,473,413	1,079,874	845,486
Loan repayment from equity investee					6,000	0	$ 0
SDC
Schedule of Equity Method Investments [Line Items]
Ownership			19.00%
Additional ownership acquired			2.00%
Payments to acquire			$ 12,800
Equity method investment					54,600	45,100
Due from related parties					14,300	100
Net revenues					24,100	$ 200
Loan agreement reached			$ 30,000
Loan receivable					$ 30,000
Subsequent Event | SDC
Schedule of Equity Method Investments [Line Items]
Loan receivable		$ 30,000
Loan repayment from equity investee		$ 30,000

[1] Long-lived assets are attributed to countries based on entity that owns the assets.