Equity Method Investments (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Jul. 24, 2017	Jul. 25, 2016	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2019
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired		17.00%
Payments to acquire		$ 46,700
Gain on derecognition of equity method investment			$ 15,800	$ 0	$ 15,769	$ 0
SDC
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired	2.00%
Payments to acquire	$ 12,800
SDC
Schedule of Equity Method Investments [Line Items]
Derecognition of equity method investment							$ 38,400
SDC | Notes Receivable
Schedule of Equity Method Investments [Line Items]
Unsecured promissory note with SDC							$ 54,200
Unsecured promissory note with SDC, current				$ 5,400