Long-Term Debt Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Debt Instrument [Line Items]
Total debt	$ 214,017	$ 190,477
Less: current portion	34,017	5,477
Long-term debt	180,000	185,000
Note payable to bank, revolving credit facility with interest at a variable rate (2016 - 1.8%; 2015 - 1.5%)
Debt Instrument [Line Items]
Total debt	$ 214,000	$ 40,300
Notes payable effective interest rate	1.80%	1.50%
Senior notes paid off April 2016 with interest at a fixed rate of 5.54% per annum.
Debt Instrument [Line Items]
Total debt	$ 0	$ 150,000
Senior notes state interest rate		5.54%
Other notes and amounts
Debt Instrument [Line Items]
Total debt	$ 17	$ 177