Derivatives (Derivatives - Fair Value and Designation) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014
Derivative Asset, Fair Value, Net [Abstract]
Interest rate swaps	$ 0	$ 34
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	4,508	3,040
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Assets [Member]
Derivative Asset, Fair Value, Net [Abstract]
Interest rate swaps	0	34
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Accrued Liabilities [Member]
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	840	650
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	$ 3,668	$ 2,390

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References+ Details

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References+ Details