Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 29, 2016	Dec. 30, 2015
Line of Credit Facility [Line Items]
Interest rate swaps liability	$ 14,600
Interest Rate Swaps 2015-2018 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 120,000
Average fixed interest rate on interest rate swaps	2.88%
Interest Rate Swaps 2018-2025 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 170,000
Average fixed interest rate on interest rate swaps	4.19%
Interest Rate Swaps 2018-2026 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 50,000
Average fixed interest rate on interest rate swaps	4.21%
Senior secured revolver [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 325,000
Outstanding amount under credit facility	198,000
Availability under the revolving facility	$ 104,600
Weighted-average interest rate (in hundredths)	2.21%	1.76%
Commitment fee for unused portion of revolving credit facility (in hundredths)	0.25%
Basis spread on variable rate debt	1.75%
Maturity date	Mar. 30, 2020
Senior secured revolver [Member] \| Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Weighted-average interest rate (in hundredths)	2.62%	2.31%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 30,000
Outstanding amount of letters of credit	$ 22,400

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 45
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

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