Accumulated Other Comprehensive Earnings (Loss) - Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	$ (2,987)	$ (4,370)	$ (6,871)	$ (9,311)
Cost of goods sold	115,457	115,210	249,247	246,646
Total before tax	(33,213)	(38,953)	(57,307)	(69,429)
Tax (expense) benefit	7,134	12,066	12,657	20,681
Net earnings	(26,079)	(26,887)	(44,650)	(48,748)
Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total before tax	464	(338)	637	(1,206)
Tax (expense) benefit	(112)	123	(154)	437
Net earnings	352	(215)	483	(769)
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		(55)	(67)	(1)
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	$ 795	$ 83	$ 1,697	$ (108)
Type of Cost, Good or Service [Extensible List]	Product [Member]	Product [Member]	Product [Member]	Product [Member]
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)	$ (993)	$ (1,097)
Product
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cost of goods sold	$ 115,246	$ 114,970	$ 248,561	$ 245,889