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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 432,804	$ 388,254
Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	293,779	253,543
Communications and technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	55,100	49,526
Industrial, utilities and energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	33,097	34,325
Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	24,678	24,779
Healthcare
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	21,960	21,364
Basic materials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 4,190	$ 4,717

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