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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 476,954  
Other comprehensive income (loss) before reclassifications (3,167) $ (2,741)
Tax (expense) or benefit 916 517
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 453 1,302
Ending balance 524,000  
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (5,186) (5,375)
Ending balance (6,984) (6,297)
Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 322 2,223
Other comprehensive income (loss) before reclassifications (678) (1,241)
Tax (expense) or benefit 0 0
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 0 0
Ending balance (356) 982
Unrealized Gains (Losses) on Marketable Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (2) 37
Other comprehensive income (loss) before reclassifications 17 33
Tax (expense) or benefit (6) (11)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 0 0
Ending balance 9 59
Pension Postretirement Liability    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (5,506) (6,763)
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 (5,506) (6,763)
Derivative Financial Instruments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 0 (872)
Other comprehensive income (loss) before reclassifications (2,506) (1,533)
Tax (expense) or benefit 922 528
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 453 1,302
Ending balance $ (1,131) $ (575)