Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable - Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 7,766	$ 8,104	$ 8,281
Charged to Costs and Expenses	1,273	950	2,517
Divestitures/ Acquisitions	1,168	38	(1)
Charge Offs	(1,389)	(905)	(1,336)
Recoveries	(293)	(995)	(1,046)
Currency Movement	(294)	574	(311)
Ending Balance	8,231	7,766	8,104
Inventories - Excess and Obsolete Allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	25,269	24,561	22,531
Charged to Costs and Expenses	3,659	2,348	3,921
Divestitures/ Acquisitions	6,204	2,628	(706)
Charge Offs	(3,328)	(3,219)	0
Recoveries	(2,709)	(2,205)	(1,142)
Currency Movement	(199)	1,156	(43)
Ending Balance	28,896	25,269	24,561
Deferred Income Tax Asset - Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	151,841	104,771	117,071
Charged to Costs and Expenses	20,274	39,307	10,782
Divestitures/ Acquisitions	33,870	0	616
Charge Offs	(93,432)	(3,322)	(8,074)
Recoveries	(17,930)	(1,712)	(10,526)
Currency Movement	(3,751)	12,797	(5,098)
Ending Balance	$ 90,872	$ 151,841	$ 104,771