Accumulated Other Comprehensive Earnings (Loss) - Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	$ (3,363)	$ (2,713)	$ (3,884)	$ (4,941)
Cost of goods sold	67,689	65,632	133,790	131,436
Total before tax	(13,731)	(16,322)	(24,094)	(30,476)
Tax (expense) benefit	3,261	4,472	5,523	8,615
Net earnings	(10,470)	(11,850)	(18,571)	(21,861)
Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total before tax	217	619	173	(868)
Tax (expense) benefit	(52)	(224)	(42)	314
Net earnings	165	395	131	(554)
Foreign Currency Derivatives | Foreign currency forward contracts | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	(20)	29	(67)	54
Postretirement and Pension Benefits | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	(331)	(366)	(662)	(731)
Product
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cost of goods sold	67,481	65,381	133,315	130,919
Product | Foreign Currency Derivatives | Commodity futures contracts | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cost of goods sold	$ 568	$ 956	$ 902	$ (191)