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Marketable Securities (Investments Available For Sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost $ 75,367 $ 75,713
Available-for-sale securities, accumulated gross unrealized gain, before tax 996 1,991
Available-for-sale securities, accumulated gross unrealized loss, before tax (713) (95)
Available-for-sale securities, fair value 75,650 77,609
SEI-Sponsored Mutual Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 8,737 8,685
Available-for-sale securities, accumulated gross unrealized gain, before tax 51 134
Available-for-sale securities, accumulated gross unrealized loss, before tax (608) (95)
Available-for-sale securities, fair value 8,180 8,724
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 2,927 2,695
Available-for-sale securities, accumulated gross unrealized gain, before tax 0 169
Available-for-sale securities, accumulated gross unrealized loss, before tax (105) 0
Available-for-sale securities, fair value 2,822 2,864
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 63,703 64,333
Available-for-sale securities, accumulated gross unrealized gain, before tax 945 1,688
Available-for-sale securities, accumulated gross unrealized loss, before tax 0 0
Available-for-sale securities, fair value $ 64,648 $ 66,021