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Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Allowance for Doubtful Accounts, Balance at beginning of year $ 49,659 $ 59,188 $ 64,129
Allowance for doubtful accounts, Charged to Income 8,336 (8) 3,789
Valuation Allowances and Reserves, Charged to Other Accounts [1] (392) (383) (2,451)
Allowance for Doubtful Accounts, Write-down 5,347 9,138 6,279
Allowance for Doubtful Accounts, Balance at end of year $ 52,256 $ 49,659 $ 59,188
[1] "Other" primarily includes the effect of fluctuations in foreign currencies and the allowance for doubtful accounts of the businesses acquired by the company. Prior to 2016, the company presented the effect of fluctuations in foreign currencies in "charged to income". Prior year amounts were reclassified in the table above to conform with current year presentation.