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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Deferred tax assets:      
Other employee benefits $ 12,237   $ 14,092
Pension and other postretirement benefits 20,124   22,758
Allowance for management fee returned on cancelled policies 3,292   3,024
Deferred revenue 3,524   0
Unrealized losses on investments 2,030   0
Other 1,246   812
Total deferred tax assets 42,453   40,686
Deferred tax liabilities:      
Depreciation 13,015   10,204
Prepaid expenses 1,376   5,568
Commissions 1,270   0
Limited partnerships 2,534   4,509
Unrealized gains on investments 0   856
Other 157   159
Total deferred tax liabilities 18,352   21,296
Net deferred tax asset $ 24,101 $ 29,578 $ 19,390