ACCUMULATED OTHER COMPREHENSIVE LOSS: (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	$ (1,496)	$ (7,371)	$ (12,130)
Product cost of goods sold	340,090	340,933	350,960
Selling, marketing and administrative expenses	108,051	117,722	119,133
Tax expense (benefit)	26,451	28,434	23,634
Net earnings	(66,127)	(62,860)	$ (60,849)
Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total before tax	2,682	(1,807)
Tax expense (benefit)	(971)	665
Net earnings	1,711	(1,142)
AOCI from Derivatives | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net	(2,510)	(1,001)
Postretirement and Pension Benefits | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Product cost of goods sold	711	812
Selling, marketing and administrative expenses	740	992
Foreign Currency Translation | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other income, net		1,298
Commodity Derivatives | Reclassified from Accumulated OCI into Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Product cost of goods sold	$ (1,623)	$ (294)