Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details 3) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7,448,000	$ 5,062,000	$ 4,139,000
Restructuring reserve activity
Restructuring liability at beginning	1,586,000
Cost paid	(4,997,000)
Restructuring Reserve, Translation and Other Adjustment	(2,044,000)
Restructuring liability at ending	1,993,000	1,586,000
June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,284,000	4,559,000	4,139,000
Restructuring reserve activity
Restructuring liability at beginning	668
Restructuring liability at ending	233,000	668
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	248,000	503,000	$ 0
Restructuring reserve activity
Restructuring liability at beginning	918,000
Restructuring liability at ending	703,000	$ 918,000
Other charges
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,412,000
Restructuring reserve activity
Restructuring liability at ending	1,057,000
Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	13,400,000
Restructuring and Related Cost, Cost Incurred to Date	16,030,000
Workforce reduction | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,075,000
Restructuring and Related Cost, Cost Incurred to Date	3,340,000
Equipment relocation | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	9,025,000
Restructuring and Related Cost, Cost Incurred to Date	10,534,000
Other charges | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1,300,000
Restructuring and Related Cost, Cost Incurred to Date	988,000
Asset Impairment Charge [Member] | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	0
Restructuring and Related Cost, Cost Incurred to Date	$ 1,168,000