Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable - Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 8,104	$ 8,281	$ 11,503
Charged to Costs and Expenses	950	2,517	2,561
Divestitures/ Acquisitions	38	(1)	40
Charge Offs	(905)	(1,336)	(803)
Recoveries	(995)	(1,046)	(4,353)
Currency Movement	574	(311)	(667)
Ending Balance	7,766	8,104	8,281
Inventories - Excess and Obsolete Allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	24,561	22,531	31,823
Charged to Costs and Expenses	2,348	3,921	3,001
Divestitures/ Acquisitions	2,628	(706)	2,755
Charge Offs	(3,219)	0	(12,744)
Recoveries	(2,205)	(1,142)	(1,407)
Currency Movement	1,156	(43)	(897)
Ending Balance	25,269	24,561	22,531
Deferred Income Tax Asset - Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	104,771	117,071	157,317
Charged to Costs and Expenses	39,307	10,782	2,840
Divestitures/ Acquisitions	0	616	(14,425)
Charge Offs	(3,322)	(8,074)	(1,823)
Recoveries	(1,712)	(10,526)	(13,988)
Currency Movement	12,797	(5,098)	(12,850)
Ending Balance	$ 151,841	$ 104,771	$ 117,071