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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 24, 2016
Composition of trade receivables      
Client receivables $ 321,472 $ 283,997  
Unbilled revenue 103,389 82,203  
Total 424,861 366,200  
Less: Allowance for doubtful accounts (2,526) (2,150)  
Trade receivables, net 422,335 364,050  
Composition of inventories      
Raw materials and supplies 19,256 18,893  
Work in process 13,163 13,681  
Finished products 74,953 63,259  
Inventories 107,372 95,833  
Composition of other current assets      
Investments 30,351 3,771  
Prepaid income taxes 55,416 40,705  
Restricted cash 591 532 $ 572
Other current assets 86,358 45,008  
Composition of other assets      
Life insurance policies 32,739 29,456  
Venture capital investments 59,511 45,331  
Restricted cash 1,944 1,736 $ 1,825
Other 15,604 11,907  
Other assets 109,798 88,430  
Composition of other current liabilities      
Accrued income taxes 32,931 25,621  
Other 683 879  
Other current liabilities 33,614 26,500  
Composition of other long-term liabilities      
Long-term pension liability 91,991 89,984  
Accrued executive supplemental life insurance retirement plan and deferred compensation plan 33,926 32,880  
Other 41,576 36,375  
Other long-term liabilities $ 167,493 $ 159,239