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Investments Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 147,753 $ 144,968
Gross unrealized gains 451 1,326
Gross unrealized losses (6,456) (3,104)
Available-for-sale securities 141,748 143,190
Equity Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 32,357 26,887
Gross unrealized gains 342 1,216
Gross unrealized losses (2,416) (737)
Available-for-sale securities 30,283 27,366
Fixed Income Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 115,396 118,081
Gross unrealized gains 109 110
Gross unrealized losses (4,040) (2,367)
Available-for-sale securities $ 111,465 $ 115,824