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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 24,468 $ 21,313 $ 22,007 $ 22,587
Valuation Allowances and Reserves, Charged to Cost and Expense 10,854 8,466 5,888  
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 21  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction [1] $ (7,699) $ (9,160) $ (6,489)  
[1] (1) Represents allowance for doubtful accounts in connection with certain acquisitions and divestitures.