Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 27, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance			$ 867	$ 514		$ 910	$ 573
Valuation Allowances and Reserves, Charged to Cost and Expense	$ 380		(426)	838
Valuation Allowances and Reserves, Charged to Other Accounts			0		$ 0
Valuation Allowances and Reserves, Deductions	$ 27		(30)	(501)
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance			5,891	3,911		$ 3,398	$ 3,394
Valuation Allowances and Reserves, Charged to Cost and Expense		$ 1,980	473		$ 4
Valuation Allowances and Reserves, Charged to Other Accounts			$ 40	0
Valuation Allowances and Reserves, Deductions				$ 0