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Investment Securities (Details 6) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Investment Securities (Details 6) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Cost Method Investments	$ 65,438		$ 65,438			$ 80,052
Equity Method Investments	99,852		99,852			90,964
Investments in unconsolidated entities	165,290		165,290			$ 171,016
Dividends received from unconsolidated entities	$ 7,500	$ 5,000	15,000	$ 15,000
Sale of investment in unconsolidated entity			17,781	$ 0
Invidi Technologies Corporation
Schedule of Investments [Line Items]
Cost Method Investments					$ 10,500
Cost-method Investments, Realized Gains			8,900
Sale of investment in unconsolidated entity			$ 17,800