Accumulated Other Comprehensive Earnings (Loss): (Components AOCI) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 28, 2014
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	$ 690,809
Balance at the end of the period	685,855	$ 678,236
AOCI from Derivatives | Foreign currency forward contracts
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(1,236)	(436)
Other comprehensive earnings (loss) before reclassifications	(1,006)	200
Reclassifications from accumulated other comprehensive loss	651	288
Other comprehensive earnings (loss) net of tax	(355)	488
Balance at the end of the period	(1,591)	52
AOCI from Derivatives | Commodity futures contracts
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(470)	(96)
Other comprehensive earnings (loss) before reclassifications	(599)	155
Reclassifications from accumulated other comprehensive loss	417	38
Other comprehensive earnings (loss) net of tax	(182)	193
Balance at the end of the period	(652)	97
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(332)	54
Other comprehensive earnings (loss) before reclassifications	1	(20)
Other comprehensive earnings (loss) net of tax	1	(20)
Balance at the end of the period	(331)	34
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	6,439	9,367
Reclassifications from accumulated other comprehensive loss	(464)	(576)
Other comprehensive earnings (loss) net of tax	(464)	(576)
Balance at the end of the period	5,975	8,791
Foreign Currency Translation
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(17,499)	(13,527)
Other comprehensive earnings (loss) before reclassifications	(1,711)	(699)
Other comprehensive earnings (loss) net of tax	(1,711)	(699)
Balance at the end of the period	(19,210)	(14,226)
Accumulated Other Comprehensive Earnings ( Loss )
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(13,098)	(4,638)
Other comprehensive earnings (loss) before reclassifications	(3,315)	(364)
Reclassifications from accumulated other comprehensive loss	604	(250)
Other comprehensive earnings (loss) net of tax	(2,711)	(614)
Balance at the end of the period	$ (15,809)	$ (5,252)