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Income Taxes - Deferred income taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Accounts receivable allowance $ 1,019 $ 1,163    
Accrued compensation 14,655 9,553    
Accrued pension liabilities 4,950 9,116    
Self-insured risks 5,746 4,301    
Deferred revenues 5,376 4,249    
Interest 2,419 5,399    
Tax credit carryforwards 7,090 11,634    
Loss carryforwards 22,805 25,523    
Lease liability 31,435 29,785    
Other 2,158 3,436    
Gross deferred income tax assets 97,653 104,159    
Unbilled revenues 5,311 6,522    
Repatriated earnings 776      
Depreciation and amortization 23,474 28,025    
Lease right-of-use asset 27,513 25,865    
Gross deferred income tax liabilities 57,074 60,412    
Net deferred income tax assets before valuation allowance 40,579 43,747    
Valuation allowance (16,579) (28,128) $ (25,864) $ (18,829)
Net deferred income tax assets 24,000 15,619    
Amounts recognized in the Consolidated Balance Sheets consist of:        
Deferred income tax assets 25,595 17,971    
Long-term deferred income tax liabilities included in "Other noncurrent liabilities" (1,595) (2,352)    
Net deferred income tax assets $ 24,000 $ 15,619