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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 501,009 $ 477,299 $ 414,501
Other comprehensive income (loss) before reclassifications 1,194 148 (1,174)
Tax (expense) or benefit (14) (590) (264)
Amounts reclassified from accumulated other comprehensive income, net of tax 209 628 1,627
Ending Balance 514,577 501,009 477,299
Accumulated Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (5,000) (5,186) (5,375)
Ending Balance (3,611) (5,000) (5,186)
Foreign Currency Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (1,188) 322 2,223
Other comprehensive income (loss) before reclassifications 1,219 (1,510) (1,901)
Tax (expense) or benefit 0 0 0
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 0
Ending Balance 31 (1,188) 322
Unrealized Gains (Losses) on Marketable Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (105) (2) 37
Other comprehensive income (loss) before reclassifications (6) (158) (60)
Tax (expense) or benefit (21) 55 21
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 0
Ending Balance (132) (105) (2)
Pension and Post-retirement Liabilities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (5,167) (5,506) (6,763)
Other comprehensive income (loss) before reclassifications (733) 499 1,975
Tax (expense) or benefit 270 (160) (718)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 0
Ending Balance (5,630) (5,167) (5,506)
Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 1,460 0 (872)
Other comprehensive income (loss) before reclassifications 714 1,317 (1,188)
Tax (expense) or benefit (263) (485) 433
Amounts reclassified from accumulated other comprehensive income, net of tax 209 628 1,627
Ending Balance $ 2,120 $ 1,460 $ 0