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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 514,577 $ 501,009
Ending balance 525,294 494,349
Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 31 (1,188)
Other comprehensive income (loss) before reclassifications (1,127) 459
Tax (expense) or benefit 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Ending balance (1,096) (729)
Unrealized Gains (Losses) on Marketable Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (132) (105)
Other comprehensive income (loss) before reclassifications (117) 57
Tax (expense) or benefit 25 (20)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Ending balance (224) (68)
Pension and Post-retirement Liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (5,630) (5,167)
Other comprehensive income (loss) before reclassifications 0 0
Tax (expense) or benefit 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Ending balance (5,630) (5,167)
Derivative Financial Instruments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 2,120 1,460
Other comprehensive income (loss) before reclassifications 2,147 (505)
Tax (expense) or benefit (526) 186
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (268) 190
Ending balance 3,473 1,331
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (3,611) (5,000)
Other comprehensive income (loss) before reclassifications 903 11
Tax (expense) or benefit (501) 166
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (268) 190
Ending balance $ (3,477) $ (4,633)