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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 514,068  
Other comprehensive income (loss) before reclassifications 1,377 $ 598
Tax (expense) or benefit (341) (92)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (87) 121
Ending balance 513,740  
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (3,611) (5,000)
Ending balance (2,662) (4,373)
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 1 345
Tax (expense) or benefit 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Ending balance 32 (843)
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 (100) 27
Tax (expense) or benefit 21 (9)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Ending balance (211) (87)
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 1,476 226
Tax (expense) or benefit (362) (83)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (87) 121
Ending balance $ 3,147 $ 1,724