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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Tax credit carryforwards $ 9,156 $ 6,654
Pension, compensation, and other employee benefits 13,022 15,173
Provisions for losses 5,133 5,826
Net operating loss carryforward 4,707 5,195
State income taxes 1,546 2,502
Other deferred income tax assets 2,920 2,796
Total deferred tax assets 36,484 38,146
Valuation allowance (3,356) (4,010)
Foreign deferred tax assets included above (2,468) (2,396)
Net deferred tax assets 30,660 31,740
Deferred tax liabilities:    
Property and equipment (14,501) (10,530)
Deferred tax related to life insurance (3,498) (3,556)
Goodwill and other intangible assets (4,759) (4,299)
Other deferred income tax liabilities (939) (463)
Total deferred tax liabilities (23,697) (18,848)
Foreign deferred tax liabilities included above 9,808 7,869
United States net deferred tax assets $ 16,771 $ 20,761