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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Tax credit carryforwards $ 7,879 $ 9,156
Pension, compensation, and other employee benefits 17,231 13,022
Provisions for losses 4,778 5,133
Net operating loss carryforward 5,371 4,707
State income taxes 3,089 1,546
Other deferred income tax assets 2,177 2,920
Total deferred tax assets 40,525 36,484
Valuation allowance (4,276) (3,356)
Foreign deferred tax assets included above (2,351) (2,468)
Net deferred tax assets 33,898 30,660
Deferred tax liabilities:    
Property and equipment (20,681) (14,501)
Deferred tax related to life insurance (3,945) (3,498)
Goodwill and other intangible assets (16,172) (4,759)
Other deferred income tax liabilities (1,858) (939)
Total deferred tax liabilities (42,656) (23,697)
Foreign deferred tax liabilities included above 31,192 9,808
United States net deferred tax assets $ 22,434 $ 16,771