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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 $ 284,279 $ 267,945
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 295,290 277,603
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 (41,094) (27,932)
Other comprehensive income (loss) before reclassifications 4,986 5,871
Reclassifications from AOCI 0 0
Net current period other comprehensive income 4,986 5,871
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 (36,108) (22,061)
Unrecognized Prior Service Cost on Pension and Other Post- Retirement Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 (397) (489)
Other comprehensive income (loss) before reclassifications (1) (2)
Reclassifications from AOCI 23 24
Net current period other comprehensive income 22 22
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 (375) (467)
Deferred Loss on Pension and Other Post- Retirement Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 (8,158) (8,322)
Other comprehensive income (loss) before reclassifications (28) (610)
Reclassifications from AOCI 88 170
Net current period other comprehensive income 60 (440)
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 (8,098) (8,762)
Deferred Gain (Loss) on Hedging Instruments [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 12 (229)
Other comprehensive income (loss) before reclassifications 12 (239)
Reclassifications from AOCI 15 113
Net current period other comprehensive income 27 (126)
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 39 (355)
Accumulated Other Comprehensive Items [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Unrealized Gain (Loss), Net of Tax, at December 31, 2016 (49,637) (36,972)
Other comprehensive income (loss) before reclassifications 4,969 5,020
Reclassifications from AOCI 126 307
Net current period other comprehensive income 5,095 5,327
Unrealized Gain (Loss), Net of Tax, at April 1, 2017 $ (44,542) $ (31,645)