Long-Term Debt Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Debt Instrument [Line Items]
Total debt	$ 312,270	$ 214,017
Current maturities of long-term debt	17,270	34,017
Long-term debt	295,000	180,000
Note payable to bank, revolving credit facility with interest at a variable rate (September 30, 2017 - 2.5%; December 31, 2016 - 1.8%)
Debt Instrument [Line Items]
Total debt	306,800	214,000
Other notes and amounts
Debt Instrument [Line Items]
Total debt	$ 5,470	$ 17
Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate Percentage		2.50%	1.80%