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Marketable Securities - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Securities Investments    
Cost $ 68,527 $ 46,158
Gross Unrealized Gains 1,931 259
Gross Unrealized Losses 3,971 2,630
Fair Value 66,487 43,787
Securities Investments [Member]    
Securities Investments    
Cost 6,470 6,463
Gross Unrealized Gains 0 10
Gross Unrealized Losses 3,945 2,523
Fair Value 2,525 3,950
Debt Securities Carried by EGL [Member]    
Securities Investments    
Cost 38,392 37,404
Gross Unrealized Gains 77 94
Gross Unrealized Losses 15 8
Fair Value 38,454 37,490
Investment Funds [Member]    
Securities Investments    
Cost 23,665 2,291
Gross Unrealized Gains 1,854 155
Gross Unrealized Losses 11 99
Fair Value $ 25,508 $ 2,347