Costs Associated with Exit and Restructuring Activities - Restructuring and Restructuring Related Charges of Actual Costs (Details 2) $ in Thousands	12 Months Ended			21 Months Ended	31 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 position	Dec. 31, 2018 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 5,062	$ 4,139	$ 3,048
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	503	0	4,923
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,950				$ 9,950
Actual costs incurred	8,896				8,896
Elimination of workforce | position				120
April 2014 Plan | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	4,050				4,050
Actual costs incurred	557				557
April 2014 Plan | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	5,900				5,900
Actual costs incurred	8,339				8,339
April 2014 Plan | Inventory write-down | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	850				850
Actual costs incurred	0				0
April 2014 Plan | Equipment relocation | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,800				1,800
Actual costs incurred	444				444
April 2014 Plan | Other charges | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,400				1,400
Actual costs incurred	113				113
April 2014 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	4,200				4,200
Actual costs incurred	4,423				4,423
April 2014 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,700				1,700
Actual costs incurred	3,916				$ 3,916
June2016 Plan
Restructuring charges
Elimination of workforce | position					230
June2016 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,559	4,139	3,048
Restructuring charges
Restructuring and Related Cost, Expected Cost	13,400				$ 13,400
Actual costs incurred	11,746				11,746
June2016 Plan | Equipment relocation | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,025				9,025
Actual costs incurred	7,807				7,807
June2016 Plan | Other charges | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,300				1,300
Actual costs incurred	964				964
June2016 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	3,075				3,075
Actual costs incurred	2,975				$ 2,975
April 2014 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 5,062	$ 4,139	$ 3,048