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Income Taxes - Deferred income taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]        
Accounts receivable allowance $ 2,672 $ 1,386    
Accrued compensation 11,256 16,182    
Accrued pension liabilities 1,878 0    
Self-insured risks 4,252 5,280    
Deferred revenues 5,114 5,045    
Interest 2,684 2,907    
Tax credit carryforwards 1,285 3,326    
Loss carryforwards 29,362 28,122    
Lease liability 27,445 28,547    
Other 1,755 2,218    
Gross deferred income tax assets 87,703 93,013    
Unbilled revenues 8,944 6,290    
Accrued pension liabilities 0 2,491    
Repatriated earnings 1,120 937    
Depreciation and amortization 19,042 27,593    
Lease right-of-use asset 23,687 24,958    
Gross deferred income tax liabilities 52,793 62,269    
Net deferred income tax assets before valuation allowance 34,910 30,744    
Valuation allowance (23,295) (14,114) $ (16,579) $ (28,128)
Net deferred income tax assets 11,615 16,630    
Amounts recognized in the Consolidated Balance Sheets consist of:        
Deferred income tax assets 19,573 21,266    
Long-term deferred income tax liabilities included in "Other noncurrent liabilities" (7,958) (4,636)    
Net deferred income tax assets $ 11,615 $ 16,630