Shareholders' Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 477,299	$ 414,501	$ 436,417
Other comprehensive income before reclassifications	148	(1,174)	(9,765)
Tax (expense) or benefit	(590)	(264)	3,311
Amounts reclassified from accumulated other comprehensive income, net of tax	628	1,627	114
Ending Balance	501,009	477,299	414,501
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(5,186)	(5,375)	965
Ending Balance	(5,000)	(5,186)	(5,375)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	322	2,223	2,913
Other comprehensive income before reclassifications	(1,510)	(1,901)	(690)
Tax (expense) or benefit	0	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Ending Balance	(1,188)	322	2,223
Unrealized Gains Losses) on Marketable Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(2)	37	81
Other comprehensive income before reclassifications	(158)	(60)	(67)
Tax (expense) or benefit	55	21	23
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Ending Balance	(105)	(2)	37
Pension and Post-retirement Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(5,506)	(6,763)	(2,140)
Other comprehensive income before reclassifications	499	1,975	(7,280)
Tax (expense) or benefit	(160)	(718)	2,657
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Ending Balance	(5,167)	(5,506)	(6,763)
Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	0	(872)	111
Other comprehensive income before reclassifications	1,317	(1,188)	(1,728)
Tax (expense) or benefit	(485)	433	631
Amounts reclassified from accumulated other comprehensive income, net of tax	628	1,627	114
Ending Balance	$ 1,460	$ 0	$ (872)