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Cost of Equities, Amortized Cost of Debt Securities and Estimated Fair Value of Insurance Subsidiary Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]    
Cost $ 311,514 $ 266,069
Unrealized gains 536 361
Unrealized losses (914) (434)
Fair value 311,136 265,996
Debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Cost 102,823 100,203
Unrealized gains 5 41
Unrealized losses (220) (86)
Fair value 102,608 100,158
Equity by industry    
Schedule Of Available For Sale Securities [Line Items]    
Cost 14,412 8,259
Unrealized gains 531 318
Unrealized losses (692) (348)
Fair value 14,251 8,229
Equity by industry | Consumer    
Schedule Of Available For Sale Securities [Line Items]    
Cost 2,271 1,539
Unrealized gains 182 107
Unrealized losses (36) (13)
Fair value 2,417 1,633
Equity by industry | Healthcare    
Schedule Of Available For Sale Securities [Line Items]    
Cost 1,896 962
Unrealized gains 116 60
Unrealized losses (37) (8)
Fair value 1,975 1,014
Equity by industry | Industrial    
Schedule Of Available For Sale Securities [Line Items]    
Cost 1,994 649
Unrealized gains 86 14
Unrealized losses (157) (22)
Fair value 1,923 641
Equity by industry | Financial Services    
Schedule Of Available For Sale Securities [Line Items]    
Cost 1,854 975
Unrealized gains 55 56
Unrealized losses (81) (6)
Fair value 1,828 1,025
Equity by industry | Technology    
Schedule Of Available For Sale Securities [Line Items]    
Cost 1,533 989
Unrealized gains 66 41
Unrealized losses (98) (34)
Fair value 1,501 996
Equity by industry | Energy    
Schedule Of Available For Sale Securities [Line Items]    
Cost 1,015 1,103
Unrealized losses (15) (159)
Fair value 1,000 944
Equity by industry | Other    
Schedule Of Available For Sale Securities [Line Items]    
Cost 3,849 2,042
Unrealized gains 26 40
Unrealized losses (268) (106)
Fair value 3,607 1,976
Cash and cash equivalents    
Schedule Of Available For Sale Securities [Line Items]    
Cost [1] 186,029 150,556
Fair value [1] 186,029 150,556
Corporate bonds | Debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Cost 46,940 49,077
Unrealized gains 5 19
Unrealized losses (122) (60)
Fair value 46,823 49,036
Debt securities issued by US government agencies | Debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Cost 22,497 25,313
Unrealized gains   19
Unrealized losses (43) (19)
Fair value 22,454 25,313
U.S. Treasury notes | Debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Cost 33,386 25,813
Unrealized gains   3
Unrealized losses (55) (7)
Fair value 33,331 25,809
Certificates of deposit    
Schedule Of Available For Sale Securities [Line Items]    
Cost 8,250 7,051
Unrealized gains   2
Unrealized losses (2)  
Fair value $ 8,248 $ 7,053
[1] Includes $29.6 million and $15.6 million of money market funds at December 31, 2015 and 2014, respectively.