Pension and Other Retirement Plans - Changes in Fair Value of Pension Plan Level 3 Assets (Details) - Pension Plans - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 28, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	$ 1,655,257	$ 1,595,294
Fair value of plans’ assets, end of year	1,530,898	1,655,257
Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	77,731
Fair value of plans’ assets, end of year	86,909	77,731
Real Estate \| Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	77,731
Realized net gains	2,032	4,003
Unrealized net gains (losses)	8,580	5,551
Transfers out of Level 3 investments	(588)	(2,447)
Purchases	1,371	1,212
Sales	(2,217)	(2,168)
Fair value of plans’ assets, end of year	86,909	77,731
Private Equity Limited Partnerships
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	1,461
Fair value of plans’ assets, end of year	456	1,461
Private Equity Limited Partnerships \| Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	1,461
Realized net gains	46	1
Unrealized net gains (losses)	(19)	(680)
Transfers out of Level 3 investments	(46)	(1)
Purchases	0	0
Sales	(986)	(248)
Fair value of plans’ assets, end of year	456	1,461
Venture capital limited partnerships
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	2,015
Fair value of plans’ assets, end of year	1,469	2,015
Venture capital limited partnerships \| Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plans’ assets, beginning of year	2,015
Realized net gains	0	0
Unrealized net gains (losses)	(521)	(56)
Transfers out of Level 3 investments	0	0
Purchases	0	0
Sales	(25)	(79)
Fair value of plans’ assets, end of year	$ 1,469	$ 2,015

Defined Benefit Plan, Purchases

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- Definition

Defined Benefit Plan, Sales

+ References

No definition available.

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- Definition

Actual return on plan assets, separately identifying the amount related to assets sold during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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- Definition

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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