Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Jan. 01, 2017
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (297)	$ 37,281	$ 31,837	$ 73,263
Provision for income taxes	$ (1,548)	$ (10,801)	$ (11,341)	$ (21,420)
Effective Income Tax Rate, Continuing Operations		29.00%	35.60%	29.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%	35.00%
Quantifying Misstatement in Current Year Financial Statements, Amount	$ (2,248)	$ (4,235)	$ (2,248)	$ (7,113)
Effective Income Tax Rate Reconciliation, Share based Compensation, Excess Tax Benefit, Amount			3,306
Unrecognized Tax Benefits	8,151		8,151
Decrease in Unrecognized Tax Benefits is Reasonably Possible	7,002		7,002
Accounts and notes receivable, net [Member]
Income Taxes Receivable	18,526		18,526		$ 18,111
Other Assets [Member]
Income Taxes Receivable	956		$ 956		$ 239
System Optimization [Member]
Provision for income taxes	$ (2,166)	$ 5,239