Long-Term Debt (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 24, 2015	Jul. 09, 2014
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 350.0
Debt Instrument Maturities Quarterly Repayments of Principal		$ 3.8
Debt Instrument, Maturity Date	Jul. 09, 2019
Revolving Credit Facility, Capacity Available for Letter of Credit	$ 40.0
Outstanding letters of credit	20.5
Total availability under revolving credit facility	$ 221.5
Average interest rate on credit agreement	3.50%
Revolving credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity		400.0
Eurocurrency [Member]
Line of Credit Facility [Line Items]
Interest rate applicable margin range, Minimum	2.00%
Interest Rate applicable margin range, Maximum	3.30%
Base Rate [Member]
Line of Credit Facility [Line Items]
Interest rate applicable margin range, Minimum	1.00%
Interest Rate applicable margin range, Maximum	2.30%
Term Loan Facility Maturing [Member]
Line of Credit Facility [Line Items]
Term loan		$ 300.0	$ 200.0