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Investment Securities (Details 6) - USD ($) $ in Thousands	6 Months Ended
Investment Securities (Details 6) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jan. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Cost Method Investments	$ 69,513			$ 80,052
Equity Method Investments	104,554			90,964
Investments in unconsolidated entities	174,067			$ 171,016
Dividends received from unconsolidated entity	7,500	$ 10,000
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)