Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Components) (Details) $ in Thousands	6 Months Ended
	Jul. 02, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	$ 477,299
Balance at ending of period	505,886
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(5,186)
Other comprehensive income (loss) before reclassifications	(2,340)
Amounts reclassified from accumulated other comprehensive (income) loss	262
Balance at ending of period	(7,264)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	322
Other comprehensive income (loss) before reclassifications	(598)
Amounts reclassified from accumulated other comprehensive (income) loss	0
Balance at ending of period	(276)
Unrealized Gains (Losses) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(2)
Other comprehensive income (loss) before reclassifications	73
Amounts reclassified from accumulated other comprehensive (income) loss	0
Balance at ending of period	71
Pension Postretirement Liability [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(5,506)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive (income) loss	0
Balance at ending of period	(5,506)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	0
Other comprehensive income (loss) before reclassifications	(1,815)
Amounts reclassified from accumulated other comprehensive (income) loss	262
Balance at ending of period	$ (1,553)