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Investments Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 129,397 $ 147,753
Gross unrealized gains 2,204 451
Gross unrealized losses (816) (6,456)
Available-for-sale securities 130,785 141,748 [1]
Equity Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 23,883 32,357
Gross unrealized gains 2,112 342
Gross unrealized losses (266) (2,416)
Available-for-sale securities 25,729 30,283
Fixed Income Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 105,514 115,396
Gross unrealized gains 92 109
Gross unrealized losses (550) (4,040)
Available-for-sale securities $ 105,056 $ 111,465
[1] Investments that calculate NAV as a practical expedient were recategorized and are no longer included within Level 2 of the valuation hierarchy as of December 31, 2015 (see Note (2) for additional information).