Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details 3) $ 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 Reserve, Noncurrent	$ 187			$ 187
Restructuring Charges	4,139	$ 3,048	$ 14,564
Restructuring reserve activity
Restructuring Reserve, Current	1,726			$ 1,726
June2016 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position				230
Restructuring reserve activity
Restructuring liability at ending	1,460			$ 1,460
June 2013 Plan April 2014 Plan and June 2016 Plan
Restructuring reserve activity
Restructuring liability at beginning	2,162
Restructuring and restructuring-related charges	4,139
Cost paid	(4,445)
Restructuring Reserve, Translation and Other Adjustment	57
Restructuring liability at ending	1,913	2,162		1,913
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position					120
Restructuring Charges	0	4,923
Restructuring and Related Cost, Expected Cost	9,950			9,950
Restructuring reserve activity
Restructuring liability at ending	0			0
June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 10,272
Restructuring and Related Cost, Expected Cost	22,600			22,600
Restructuring reserve activity
Restructuring liability at ending	0			0
Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,139	$ 3,048
Restructuring and Related Cost, Expected Cost	13,400			13,400
Operating Expense | April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	5,900			5,900
Workforce reduction | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Elimination of workforce | position						480
Workforce reduction | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,075			3,075
Workforce reduction | Operating Expense | April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	4,200			4,200
Workforce reduction | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	10,150			10,150
Equipment relocation | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	9,025			9,025
Equipment relocation | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	20,800			20,800
Asset impairment charge | Operating Expense | June 2013 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,000			3,000
Other charges | Operating Expense | June2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 1,300			$ 1,300