Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable - Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 3,137	$ 3,709	$ 5,112
Charged to Costs and Expenses	159	353	898
Divestitures/ Acquisitions	368	0	38
Charge Offs	(969)	(567)	(1,644)
Recoveries	(86)	(176)	(465)
Currency Movement	(40)	(182)	(230)
Ending Balance	2,569	3,137	3,709
Inventories - Excess and Obsolete Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	17,364	19,887	21,301
Charged to Costs and Expenses	6,403	2,801	2,217
Divestitures/ Acquisitions	452	0	2,628
Charge Offs	(2,333)	(2,464)	(5,292)
Recoveries	(606)	(2,675)	(1,685)
Currency Movement	(35)	(185)	718
Ending Balance	21,245	17,364	19,887
Deferred Income Tax Asset - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	39,402	47,636	13,124
Charged to Costs and Expenses	12,358	15,626	37,670
Divestitures/ Acquisitions	330	(2)	0
Charge Offs	0	(22,577)	(2,675)
Recoveries	(1,629)	(928)	(1,047)
Currency Movement	(41)	(353)	564
Ending Balance	$ 50,420	$ 39,402	$ 47,636