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Marketable Securities - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Securities Investments    
Cost $ 63,989 $ 68,527
Gross Unrealized Gains 2,945 1,931
Gross Unrealized Losses 4,105 3,971
Fair Value 62,829 66,487
Securities Investments [Member]    
Securities Investments    
Cost 7,123 6,470
Gross Unrealized Gains 5 0
Gross Unrealized Losses 4,027 3,945
Fair Value 3,101 2,525
Debt Securities Carried by EGL [Member]    
Securities Investments    
Cost 34,363 38,392
Gross Unrealized Gains 142 77
Gross Unrealized Losses 0 15
Fair Value 34,505 38,454
Investment Funds [Member]    
Securities Investments    
Cost 22,503 23,665
Gross Unrealized Gains 2,798 1,854
Gross Unrealized Losses 78 11
Fair Value $ 25,223 $ 25,508