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Marketable Securities (Investments Available For Sale) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost $ 87,872 $ 81,639
Available-for-sale securities, accumulated gross unrealized gain, before tax 1,423 397
Available-for-sale securities, accumulated gross unrealized loss, before tax (923) (742)
Available-for-sale securities, fair value 88,372 81,294
SEI-Sponsored Mutual Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 22,263 8,474
Available-for-sale securities, accumulated gross unrealized gain, before tax 55 0
Available-for-sale securities, accumulated gross unrealized loss, before tax (923) (742)
Available-for-sale securities, fair value 21,395 7,732
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 2,964 2,857
Available-for-sale securities, accumulated gross unrealized gain, before tax 52 68
Available-for-sale securities, accumulated gross unrealized loss, before tax 0 0
Available-for-sale securities, fair value 3,016 2,925
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost 62,645 70,308
Available-for-sale securities, accumulated gross unrealized gain, before tax 1,316 329
Available-for-sale securities, accumulated gross unrealized loss, before tax 0 0
Available-for-sale securities, fair value $ 63,961 $ 70,637