Costs Associated with Exit and Restructuring Activities Costs Associated with Exit and Restructuring Activities - June 2016 Plan (Details) - June 2016 Plan $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) employee	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee	230
Actual costs incurred	$ 4,548
Total restructuring, impairment and restructuring related charges
Restructuring Reserve	1,279	$ 1,460
Operating Earnings
Restructuring Cost and Reserve [Line Items]
Planned Costs	13,400
Actual costs incurred	8,382
Equipment relocation
Restructuring Cost and Reserve [Line Items]
Planned Costs	9,025
Other charges
Restructuring Cost and Reserve [Line Items]
Planned Costs	1,300
Other charges | Operating Earnings
Restructuring Cost and Reserve [Line Items]
Actual costs incurred	745
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Planned Costs	3,075
Workforce reduction | Operating Earnings
Restructuring Cost and Reserve [Line Items]
Actual costs incurred	3,089
Minimum
Restructuring Cost and Reserve [Line Items]
Planned Costs	$ 13,400