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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]        
Valuation Allowances and Reserves, Balance $ 22,007 $ 22,587 $ 21,084 $ 19,309
Valuation Allowances and Reserves, Charged to Cost and Expense 5,888 6,099 5,937  
Valuation Allowances and Reserves, Charged to Other Accounts 21 1,305 194  
Valuation Allowances and Reserves, Deductions [1] $ (6,489) $ (5,901) $ (4,356)  
[1] (1) Represents allowance for doubtful accounts in connection with certain acquisitions and divestitures.