Costs Associated with Exit and Restructuring Activities Costs Associated with Exit and Restructuring Activities - June 2016 Plan (Details) - June 2016 Plan - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Actual costs incurred	$ 5,518
Total restructuring, impairment and restructuring related charges
Restructuring Reserve	1,223	$ 1,460
Operating Earnings
Restructuring Cost and Reserve [Line Items]
Planned Costs	13,400
Actual costs incurred	9,554
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	825
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	3,211
Minimum
Restructuring Cost and Reserve [Line Items]
Planned Costs	$ 13,400