Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 25,443	$ 24,468	$ 21,313	$ 22,007
Valuation Allowances and Reserves, Charged to Cost and Expense		7,006	10,854	8,466
Valuation Allowances and Reserves, Charged to Other Accounts		52	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	[1]	$ (6,083)	$ (7,699)	$ (9,160)

[1] ⁽¹⁾  Represents allowance for doubtful accounts in connection with certain acquisitions and divestitures.