Fair Value Measurements Derivative Instruments (Details) $ in Thousands		6 Months Ended
		Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	May. 31, 2015 USD ($) cash_flow_hedge	Dec. 28, 2014 USD ($) cash_flow_hedge
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held | cash_flow_hedge				7	7
Payments for termination of cash flow hedges		$ 7,337	$ 0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		7,275
Gain (Loss) on Cash Flow Hedge Ineffectiveness, net		0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Payments for termination of cash flow hedges		7,275
Payments for fees to terminate cash flow hedge		$ 62
Interest Rate Swap [Member] | Other Liabilities [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Derivatives, Fair Value [Line Items]
Cash flow hedges	[1]				$ 3,343
Cash Flow Hedging [Member] | Term A Loan, 2018 [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount				$ 350,000	350,000
Cash Flow Hedging [Member] | Term B Loan, 2019 [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount				$ 100,000	$ 100,000

[1] The fair values were based on quoted market prices in markets that are not considered active markets.