Costs Associated with Exit and Restructuring Activities Costs Associated with Exit and Restructuring Activities - June 2016 Plan (Details) - June 2016 Plan - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Actual costs incurred	$ 9,165
Total restructuring, impairment and restructuring related charges
Restructuring Reserve	537	$ 668
Operating Earnings
Restructuring Cost and Reserve [Line Items]
Planned Costs	13,400
Actual costs incurred	14,078
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	1,826
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	$ 3,087