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Investment Securities (Details 6) - USD ($) $ in Thousands	3 Months Ended
Investment Securities (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Cost Method Investments	$ 69,513			$ 80,052
Equity Method Investments	96,479			90,964
Investments in unconsolidated entities	165,992			$ 171,016
Dividends received from unconsolidated entity	7,500	$ 0
Sale of investment in unconsolidated entity	17,781	$ 0
Invidi Technologies Corporation [Member]
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)