Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2016

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension and Other Postretirement Benefit Costs

The components of net periodic pension and other postretirement benefit costs (credits) for the last three fiscal years were as follows (in thousands):

	Pension Benefits
	2016			2015			2014
Components of net periodic pension costs:
Service cost	$	3,849		$	32,582		$	27,729
Interest cost		40,459			39,628			37,468
Expected return on plan assets		(48,296	)		(54,881	)		(47,396	)
Amortization of prior service cost		157			195			198
Amortization of net loss		8,255			10,394			2,294
Settlements		4,487			3,358			2,370
Special termination benefit		—			422			—
Net periodic pension costs	$	8,911		$	31,698		$	22,663

	Other Postretirement Plans
	2016			2015			2014
Components of net periodic other postretirement     benefit costs (credits):
Service cost	$	37		$	37		$	79
Interest cost		296			264			318
Amortization of prior service cost (credit)		6			(62	)		(334	)
Amortization of net (gain) loss		(71	)		14			(75	)
Curtailment gain		—			—			(2,096	)
Net periodic other postretirement benefit costs    (credits)	$	268		$	253		$	(2,108	)

Changes in Plan Assets and Benefit Obligations

Changes in plan assets and benefit obligations recorded in Other comprehensive loss for pension and Other postretirement benefits for the last three fiscal years were as follows (in thousands):

	Pension Benefits
	2016			2015			2014
Changes recognized in other comprehensive loss:
Actuarial loss	$	(64,296	)	$	(3,171	)	$	(160,345	)
Curtailment		—			73,191			—
Prior year correction		(21,917	)		—			—
Amortization of prior service cost		157			195			198
Amortization of net loss		8,255			10,394			2,294
Settlements		4,487			3,358			2,370
Net amount recognized	$	(73,314	)	$	83,967		$	(155,483	)
	Other Postretirement Plans
	2016			2015			2014
Changes recognized in other comprehensive loss:
Actuarial (loss) gain	$	(174	)	$	1,035		$	(986	)
Prior service (cost) credit		—			(1,291	)		3,612
Amortization of prior service cost (credit)		6			(62	)		(334	)
Amortization of net loss (gain)		(71	)		14			(75	)
Curtailment		—			—			(2,096	)
Net amount recognized	$	(239	)	$	(304	)	$	121

Funded Status of the Defined Benefit Plans

The funded status of the defined benefit plans for the last three fiscal years was as follows (in thousands):  

	Pension Benefits
	2016			2015			2014
Change in benefit obligation:
Benefit obligation at beginning of period	$	862,886		$	970,469		$	733,752
Service cost		3,849			32,582			27,729
Interest cost		40,459			39,628			37,468
Actuarial loss (gain)		73,855			(73,282	)		199,807
Curtailment		—			(73,191	)		—
Prior year correction		21,917			—			—
Settlements		(16,002	)		(15,287	)		(11,517	)
Special termination benefit		—			422			—
Benefit disbursements		(20,730	)		(18,455	)		(16,770	)
Benefit obligation at end of period		966,234			862,886			970,469
Change in plan assets:
Fair value of plan assets at beginning of period		742,341			749,166			641,749
Return on plan assets		57,855			(21,572	)		86,857
Employer contribution		35,702			48,489			48,847
Settlements		(16,002	)		(15,287	)		(11,517	)
Benefit disbursements		(20,730	)		(18,455	)		(16,770	)
Fair value of plan assets at end of period		799,166			742,341			749,166
Net amount recognized	$	(167,068	)	$	(120,545	)	$	(221,303	)

	Other Postretirement Plans
	2016			2015			2014
Change in benefit obligation:
Benefit obligation at beginning of period	$	6,974		$	6,789		$	9,375
Service cost		37			37			79
Interest cost		296			264			318
Employee contributions		204			209			215
Actuarial loss (gain)		174			(1,035	)		986
Curtailment		—			—			(3,612	)
Plan amendment		—			1,291			—
Benefit disbursements		(733	)		(581	)		(572	)
Benefit obligation at end of period		6,952			6,974			6,789
Change in plan assets:
Fair value of plan assets at beginning of period		—			—			—
Employer contribution		529			372			357
Employee contributions		204			209			215
Benefit disbursements		(733	)		(581	)		(572	)
Fair value of plan assets at end of period		—			—			—
Net amount recognized	$	(6,952	)	$	(6,974	)	$	(6,789	)

	Pension Benefits
	2016			2015			2014
Amounts recognized in the consolidated    balance sheets consist of the following:
Accrued benefit obligation—current	$	(549	)	$	(546	)	$	(453	)
Accrued benefit obligation—noncurrent		(166,519	)		(119,999	)		(220,850	)
Net amount recognized in the consolidated    balance sheets	$	(167,068	)	$	(120,545	)	$	(221,303	)
Amounts recognized in Accumulated other    comprehensive loss consist of the following:
Prior service cost	$	281		$	438		$	634
Net loss		221,146			147,675			231,446
Net loss recognized in Accumulated other    comprehensive loss	$	221,427		$	148,113		$	232,080
Additional information:
Accumulated benefit obligation	$	963,008		$	854,858		$	888,937

	Other Postretirement Plans
	2016			2015			2014
Amounts recognized in the consolidated    balance sheets consist of the following:
Accrued benefit obligation—current	$	(576	)	$	(525	)	$	(533	)
Accrued benefit obligation—noncurrent		(6,376	)		(6,449	)		(6,256	)
Net amount recognized in the consolidated    balance sheets	$	(6,952	)	$	(6,974	)	$	(6,789	)
Amounts recognized in Accumulated other    comprehensive loss consist of the following:
Net gain	$	825		$	1,064		$	1,368
Net gain recognized in Accumulated other    comprehensive loss	$	825		$	1,064		$	1,368

	Pension Benefits		Other Postretirement Benefits
Amounts expected to be amortized from    Accumulated other comprehensive loss in the    next fiscal year:
Net loss (gain)	$	3,998	$	(149	)
Prior service cost		138		6
Net expected to be amortized	$	4,136	$	(143	)

Assumptions to Determine Benefit Obligations at Period-end and Net Pension Costs

Weighted average assumptions used to determine benefit obligations at period-end and net pension costs for the last three fiscal years were as follows: 

	Pension Benefits
	2016			2015			2014
Benefit obligation:
Discount rate		4.25	%		4.64	%		4.25	%
Annual compensation increase		3.60	%		3.60	%		3.60	%
Net cost:
Discount rate		4.64	%		4.25	%		5.19	%
Expected return on plan assets		6.50	%		7.00	%		7.25	%
Annual compensation increase		3.60	%		3.60	%		3.60	%

	Other Postretirement Plans
	2016			2015			2014
Benefit obligation—discount rate		4.25	%		4.40	%		4.05	%
Net cost—discount rate		4.40	%		4.05	%		4.80	%

Assumed Health Care Trend Rates

The assumed healthcare trend rates for the last three fiscal years were as follows: 

	2016			2015			2014
Immediate rate		7.40	%		7.40	%		7.10	%
Ultimate trend rate		4.50	%		4.50	%		4.50	%
Year the rate reaches the ultimate trend rate	2037				2038			2028

Schedule of Level Three Defined Benefit Plan Assets

The following table (in thousands) sets forth the fair value of our defined benefit plans’ assets by asset fair value hierarchy level.

	Asset Fair Value as of December 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	10,073	$	—	$	—	$	10,073
Equities:
Domestic		30,759		—		—		30,759
International		829		—		—		829
Mutual funds:
Domestic equities		37,711		—		—		37,711
International equities		28,975		—		—		28,975
Long-term debt securities:
Corporate debt securities:
Domestic		—		196,743		—		196,743
International		—		20,120		—		20,120
U.S. government securities		—		154,007		—		154,007
Government agencies securities		—		7,548		—		7,548
Other		—		2,545		—		2,545
	$	108,347	$	380,963	$	—		489,310
Common collective trust funds:
Cash equivalents								6,447
Domestic equities								244,152
International equities								59,257
Total investments measured at net asset value      as a practical expedient								309,856
Total defined benefit plans’ assets							$	799,166

	Asset Fair Value as of January 2, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	4,576	$	—	$	—	$	4,576
Mutual funds:
Domestic equities		33,033		—		—		33,033
International equities		26,760		—		—		26,760
Long-term debt securities:
Corporate debt securities:
Domestic		—		181,973		—		181,973
International		—		18,000		—		18,000
U.S. government securities		—		143,904		—		143,904
Government agencies securities		—		7,789		—		7,789
Other		—		3,216		—		3,216
	$	64,369	$	354,882	$	—		419,251
Common collective trust funds:
Cash equivalents								5,272
Domestic equities								264,534
International equities								53,284
Total investments measured at net asset value      as a practical expedient								323,090
Total defined benefit plans’ assets							$	742,341

Estimated Future Benefit Payments

Estimated future benefit payments, under Company sponsored plans as of December 31, 2016, were as follows (in thousands):

	Pension Benefits		Postretirement Plans
2017	$	51,338	$	588
2018		37,227		589
2019		41,116		569
2020		42,688		576
2021		44,445		562
Subsequent five years		236,195		2,517

Multiemployer Pension Plans

Pension Fund	EIN/ Plan Number	PPA Zone Status		FIP/RP Status Pending/ Implemented	Surcharge Imposed	Expiration Dates
		2016	2015
Western Conference of Teamsters    Pension Trust Fund	91-6145047/001	Green	Green	N/A	No	3/1/17 to 9/30/20
Minneapolis Food Distributing    Industry Pension Plan	41-6047047/001	Green	Green	Implemented	No	4/1/17
Teamster Pension Trust Fund of    Philadelphia and Vicinity	23-1511735/001	Yellow	Yellow	Implemented	No	2/10/18
Truck Drivers & Helpers Local    355 Pension Fund	52-6043608-001	N/A(1)	Yellow	Implemented	No	N/A(1)
Local 703 I.B. of T. Grocery and    Food Employees’ Pension Plan	36-6491473/001	Green	Green	N/A	No	6/30/18
United Teamsters Trust Fund A	13-5660513/001	Yellow	Yellow	Implemented	No	5/30/19
Warehouse Employees Local    169 and Employers Joint    Pension Fund	23-6230368/001	Red	Red	Implemented	No	2/10/18
Warehouse Employees Local    No. 570 Pension Fund	52-6048848/001	N/A(1)	Green	N/A	No	N/A(1)
Local 705 I.B. of T. Pension    Trust Fund	36-6492502/001	Red	Red	Implemented	No	12/29/18

(1) The Company ceased operations at its Baltimore, Maryland distribution center in June 2016 and reached closure agreements with Local 570 and Local 355 in June 2016 and October 2016, respectively. As noted below, the Company reached an agreement with the respective plan administrators to settle the related multiemployer pension withdrawal liabilities.

Contributions to Multiemployer Pension Plans

The following table provides information about the Company’s contributions to its multiemployer pension plans. For plans that are not individually significant to the Company, the total amount of USF contributions is aggregated. Prior year contribution amounts have been reclassified to Other Funds for a plan no longer considered significant in 2016.

							USF Contributions
							Exceed 5% of
	USF Contribution(1)(2)						Total Plan Contributions(3)
	(in thousands)
	2016		2015		2014		2015		2014
Pension Fund
Western Conference of Teamsters Pension Trust Fund	$	10,104	$	10,227	$	9,761	No		No
Minneapolis Food Distributing Industry Pension Plan		5,162		5,200		5,026	Yes		Yes
Teamster Pension Trust Fund of Philadelphia and Vicinity		3,442		3,461		3,163	No		No
Truck Drivers and Helpers Local 355 Pension Fund(2)(4)		648		1,321		1,373	Yes		Yes
Local 703 I.B. of T. Grocery and Food Employees’ Pension Plan		1,258		1,366		1,282	Yes		Yes
United Teamsters Trust Fund A		1,668		1,554		1,537	Yes		Yes
Warehouse Employees Local 169 and Employers Joint Pension Fund		900		897		907	Yes		Yes
Warehouse Employees Local No. 570 Pension Fund(2)(4)		457		908		863	Yes		Yes
Local 705 I.B. of T. Pension Trust Fund		2,923		2,729		2,479	No		No
Other Funds		6,074		5,967		5,653		—		—
	$	32,636	$	33,630	$	32,044

(1) Contributions made to these plans during the Company’s fiscal year, which may not coincide with the plans’ fiscal years.

(2) Contributions do not include payments related to multiemployer pension withdrawals/settlements.

(3) Indicates whether the Company was listed in the respective multiemployer plan Form 5500 for the applicable plan year as having made more than 5% of total contributions to the plan.

(4) The Company ceased operations at its Baltimore, Maryland distribution center in June 2016. In December 2016, the Company reached a settlement agreement with the respective plan administrators and paid $46 million to settle its multiemployer pension withdrawal liabilities associated with the Baltimore, Maryland facility.