Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity method			$ 95,231		$ 91,702
Other equity investments without a readily determinable fair value			65,438		69,725
Total investments in unconsolidated entities			$ 160,669	$ 168,344	$ 161,427
Invidi Technologies Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Cost Method Investment, Amount Sold	$ 19,400
Cost Method Investments	$ 10,500
Cost-method Investments, Realized Gains		$ 8,900