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Details of Certain Consolidated Balance Sheet Captions (Tables)
 12 Months Ended
Dec. 31, 2020
Details of Certain Consolidated Balance Sheet Captions [Abstract]  
Accounts Receivable, net Accounts receivable, net were:
 December 31,
 20202019
 (Amounts in thousands)
Trade accounts receivables$808,459 $830,919 
Less: allowance for doubtful accounts(59,280)(47,269)
Other short-term receivables20,179 18,031 
Less: allowance for doubtful accounts(15,896)(6,143)
Accounts receivable, net$753,462 $795,538 
Property, Plant and Equipment, net Property, plant and equipment, net were:
 December 31,
 20202019
 (Amounts in thousands)
Land$65,894 $64,778 
Buildings and improvements446,008 419,454 
Machinery, equipment and tooling699,256 666,376 
Software, furniture and fixtures and other439,063 427,866 
Gross property, plant and equipment1,650,221 1,578,474 
Less: accumulated depreciation(1,093,348)(1,014,910)
Property, plant and equipment, net$556,873 $563,564 
Accrued Liabilities Accrued liabilities were:
 December 31,
 20202019
 (Amounts in thousands)
Wages, compensation and other benefits$225,133 $192,354 
Commissions and royalties22,847 23,027 
Warranty costs and late delivery penalties27,757 30,625 
Sales and use tax29,067 18,146 
Income tax31,378 20,018 
Other127,040 117,215 
Accrued liabilities$463,222 $401,385 
Retirement Obligations and Other Liabilities Retirement obligations and other liabilities were:
 December 31,
 20202019
 (Amounts in thousands)
Pension and postretirement benefits$225,994 $199,603 
Deferred taxes84,345 149,633 
Operating lease liabilities 176,246 151,523 
Legal and environmental101,203 99,744 
Uncertain tax positions and other tax liabilities50,259 42,086 
Other54,286 39,928 
Retirement obligations and other liabilities$692,333 $682,517