Costs Associated with Exit and Restructuring Activities - Restructuring and Restructuring Related Charges of Actual Costs (Details 2) $ in Thousands	12 Months Ended			19 Months Ended	21 Months Ended	31 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) position	Dec. 31, 2015 position	Dec. 31, 2015 position
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 4,139	$ 3,048	$ 14,564
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	4,923
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,950			$ 9,950
Actual costs incurred	8,393			8,393
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	7,836			7,836
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	3,413			$ 3,413
June2016 Plan
Restructuring charges
Elimination of workforce | position				230
June2016 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,139	3,048
Restructuring charges
Restructuring and Related Cost, Expected Cost	13,400			$ 13,400
Actual costs incurred	7,187			7,187
June2016 Plan | Equipment relocation | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	9,025			9,025
Actual costs incurred	3,574			3,574
June2016 Plan | Other charges | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,300			1,300
Actual costs incurred	686			686
June2016 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	3,075			3,075
Actual costs incurred	2,927			2,927
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	15,195
April 2014 Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0	0	631
April 2014 Plan | Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	4,139	3,048	14,564
June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 10,272
Restructuring charges
Restructuring and Related Cost, Expected Cost	22,600			22,600
Actual costs incurred		27,596
June 2013 Plan | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	1,800			1,800
Actual costs incurred		3,637
June 2013 Plan | Inventory write-down | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	800			800
Actual costs incurred		1,143
June 2013 Plan | Equipment relocation | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	900			900
Actual costs incurred		1,792
June 2013 Plan | Equipment relocation | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	20,800			20,800
Actual costs incurred		23,959
June 2013 Plan | Other charges | Cost of goods sold
Restructuring charges
Restructuring and Related Cost, Expected Cost	100			100
Actual costs incurred		702
June 2013 Plan | Workforce reduction
Restructuring charges
Elimination of workforce | position						480
June 2013 Plan | Workforce reduction | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	10,150			10,150
Actual costs incurred		9,615
June 2013 Plan | Asset impairment charge | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	3,000			3,000
Actual costs incurred		4,139
June 2013 Plan | Other charges, including pension termination costs | Operating Expense
Restructuring charges
Restructuring and Related Cost, Expected Cost	$ 7,650			$ 7,650
Actual costs incurred		$ 10,205