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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Changes In The Projected Benefit Obligation, The Fair Value Of Plan Assets And The Determination Of The Amounts Recognized
 
Qualified Pension Plans
 
Non-Qualified Pension Plans
(Dollars in thousands)
2014
 
2013
 
2014
 
2013
Change in projected benefit obligation:
 
 
 
 
 
 
 
Projected benefit obligation at beginning of year
$
1,523,531

 
$
1,680,603

 
$
70,814

 
$
78,218

Interest cost on projected benefit obligation
75,030

 
70,022

 
3,451

 
3,213

Plan settlement
(36,237
)
 
—

 
—

 
—

Actuarial loss (gain)
254,379

 
(177,347
)
 
9,182

 
(5,508
)
Benefits paid
(54,536
)
 
(49,747
)
 
(5,101
)
 
(5,109
)
Projected and accumulated benefit obligation at
end of year
$
1,762,167

 
$
1,523,531

 
$
78,346

 
$
70,814

Change in plan assets:
 
 
 
 
 
 
 
Fair value of plan assets at beginning of year
$
1,438,865

 
$
1,281,261

 
$
—

 
$
—

Actual return on plan assets
211,322

 
152,014

 
—

 
—

Con-way contributions
142,280

 
55,337

 
5,101

 
5,109

Plan settlement
(36,237
)
 
—

 
—

 
—

Benefits paid
(54,536
)
 
(49,747
)
 
(5,101
)
 
(5,109
)
Fair value of plan assets at end of year
$
1,701,694

 
$
1,438,865

 
$
—

 
$
—

Funded status of the plans
$
(60,473
)
 
$
(84,666
)
 
$
(78,346
)
 
$
(70,814
)
Amounts recognized in the balance sheet consist of:
 
 
 
 
 
 
 
Long-term assets
$
18,110

 
$
15,018

 
$
—

 
$
—

Current liabilities
—

 
—

 
(5,148
)
 
(5,145
)
Long-term liabilities
(78,583
)
 
(99,684
)
 
(73,198
)
 
(65,669
)
Net amount recognized
$
(60,473
)
 
$
(84,666
)
 
$
(78,346
)
 
$
(70,814
)
Plans with a projected and accumulated benefit obligation
in excess of plan assets:
 
 
 
 
 
 
 
Projected and accumulated benefit obligation
$
1,740,798

 
$
1,502,541

 
$
78,346

 
$
70,814

Fair value of plan assets
1,622,215

 
1,402,857

 
—

 
—

Weighted-average assumptions as of December 31:
 
 
 
 
 
 
 
Discount rate
4.20
%
 
5.05
%
 
4.20
%
 
5.05
%
  
Amounts Included In Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized In Net Periodic Benefit Expense
 
Qualified Pension Plans
 
Non-Qualified Pension Plans
(Dollars in thousands)
2014
 
2013
 
2014
 
2013
Actuarial loss
$
(524,414
)
 
$
(413,879
)
 
$
(35,673
)
 
$
(27,367
)
Prior-service cost
(40,809
)
 
(42,428
)
 
(99
)
 
(104
)
 
$
(565,223
)
 
$
(456,307
)
 
$
(35,772
)
 
$
(27,471
)
  
Schedule Of Net Periodic Benefit Cost Expected In Next Fiscal Year
(Dollars in thousands)
Qualified Pension Plans
 
Non-Qualified Pension Plans
Reclassification of actuarial loss to net periodic benefit expense (income)
$
12,494

 
$
1,184

Reclassification of prior-service cost to net periodic benefit expense (income)
$
1,619

 
$
5

  
Components Of Net Periodic Benefit Expense (Income)
 
Qualified Pension Plans
 
Non-Qualified Pension Plans
(Dollars in thousands)
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Net periodic benefit expense (income):
 
 
 
 
 
 
 
 
 
 
 
Interest cost on benefit obligation
$
75,030

 
$
70,022

 
$
70,168

 
$
3,451

 
$
3,213

 
$
3,438

Expected return on plan assets
(93,085
)
 
(91,324
)
 
(84,411
)
 
—

 
—

 
—

Amortization of actuarial loss
9,642

 
18,272

 
19,432

 
876

 
1,118

 
958

Amortization of prior-service cost
1,619

 
1,670

 
14

 
5

 
5

 
—

Curtailment loss
—

 
1,197

 
—

 
—

 
—

 
44

Settlement loss
15,965

 
—

 
—

 
—

 
—

 
—

Net periodic benefit expense (income)
$
9,171

 
$
(163
)
 
$
5,203

 
$
4,332

 
$
4,336

 
$
4,440

Amounts recognized in other comprehensive
income or loss:
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss (gain)
$
136,142

 
$
(238,037
)
 
$
(720
)
 
$
9,182

 
$
(5,508
)
 
$
3,574

Prior-service cost
—

 
—

 
44,961

 
—

 
—

 
109

Reclassification of actuarial loss to net
periodic benefit expense (income)
(25,607
)
 
(18,272
)
 
(19,432
)
 
(876
)
 
(1,118
)
 
(1,002
)
Reclassification of prior-service cost to
net periodic benefit expense (income)
(1,619
)
 
(2,867
)
 
(14
)
 
(5
)
 
(5
)
 
—

Loss (gain) recognized in other
comprehensive income or loss
$
108,916

 
$
(259,176
)
 
$
24,795

 
$
8,301

 
$
(6,631
)
 
$
2,681

Weighted-average assumptions used to
calculate net cost:
 
 
 
 
 
 
 
 
 
 
 
Discount rate
5.05
%
 
4.25
%
 
4.65
%
 
5.05
%
 
4.25
%
 
4.65
%
Expected long-term rate of return on
plan assets
6.53
%
 
7.10
%
 
7.65
%
 
—
%
 
—
%
 
—
%
  
Expected Benefit Payments
(Dollars in thousands)
Qualified Pension Plans
 
Non-Qualified Pension Plans
Year ending December 31:
 
 
 
2015
$
61,381

 
$
5,148

2016
65,705

 
5,191

2017
70,081

 
5,257

2018
74,579

 
5,240

2019
79,480

 
5,234

2020-2024
465,421

 
25,705

  
Summary Of Fair Value Of Pension Plan Assets
 
December 31, 2014
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents
 
 
 
 
 
 
 
Short-term investment fund [a]
$
48,296

 
$
—

 
$
48,296

 
$
—

Equity
 
 
 
 
 
 
 
U.S. large companies
 
 
 
 
 
 
 
S&P 500 futures [b]
2,309

 
2,309

 
—

 
—

Growth [c]
102,653

 
102,653

 
—

 
—

Value [c]
99,466

 
99,466

 
—

 
—

U.S. small companies
 
 
 
 
 
 
 
Value [c]
32,298

 
32,298

 
—

 
—

International
 
 
 
 
 
 
 
Growth [c]
92,259

 
92,259

 
—

 
—

Value fund [a]
72,336

 
—

 
72,336

 
—

Fixed-income securities
 
 
 
 
 
 
 
Global long-term debt instruments [d]
1,252,077

 
131,997

 
1,120,080

 
—

Total
$
1,701,694

 
$
460,982

 
$
1,240,712

 
$
—
 
December 31, 2013
(Dollars in thousands)
Total
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents
 
 
 
 
 
 
 
Short-term investment fund [a]
$
65,100

 
$
—

 
$
65,100

 
$
—

Equity
 
 
 
 
 
 
 
U.S. large companies
 
 
 
 
 
 
 
S&P 500 futures [b]
3,482

 
3,482

 
—

 
—

Growth [c]
99,050

 
99,050

 
—

 
—

Value [c]
101,154

 
101,154

 
—

 
—

U.S. small companies
 
 
 
 
 
 
 
Value [c]
57,403

 
57,403

 
—

 
—

International
 
 
 
 
 
 
 
Growth [c]
91,058

 
91,058

 
—

 
—

Value fund [a]
94,927

 
—

 
94,927

 
—

Fixed-income securities
 
 
 
 
 
 
 
U.S. long-term debt instruments [d]
832,915

 
91,824

 
741,091

 
—

Real estate
 
 
 
 
 
 
 
Private fund [e]
40,412

 
—

 
—

 
40,412

Hedge fund
 
 
 
 
 
 
 
Multi-Strategy [f]
53,364

 
—

 
—

 
53,364

Total
$
1,438,865

 
$
443,971

 
$
901,118

 
$
93,776
Summary Of The Change In Fair Value For Pension Assets
(Dollars in thousands)
Private real
estate fund
 
Hedge fund
 
Total
Balance at December 31, 2012
$
36,911

 
$
50,149

 
$
87,060

Actual return on plan assets relating to assets still held at the reporting date
3,501

 
3,215

 
6,716

Balance at December 31, 2013
40,412

 
53,364

 
93,776

Actual return on plan assets relating to assets sold during the period
1,588

 
1,169

 
2,757

Redemption
(42,000
)
 
(51,882
)
 
(93,882
)
Asset reclassification [a]
—

 
(2,651
)
 
(2,651
)
Balance at December 31, 2014
$
—

 
$
—

 
$
—

  
Postretirement Medical Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Amounts Included In Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized In Net Periodic Benefit Expense
(Dollars in thousands)
2014
 
2013
Actuarial gain
$
8,508

 
$
19,537

Prior-service credit
16,503

 
19,366

 
$
25,011

 
$
38,903

  
Components Of Net Periodic Benefit Expense (Income)
(Dollars in thousands)
2014
 
2013
 
2012
Net periodic benefit expense (income):
 
 
 
 
 
Service cost - benefits earned during the year
$
950

 
$
1,459

 
$
1,679

Interest cost on benefit obligation
2,734

 
3,434

 
4,318

Amortization of actuarial gain
(2,111
)
 
(1
)
 
—

Amortization of prior-service credit
(2,863
)
 
(1,457
)
 
(1,206
)
Net periodic benefit expense (income)
$
(1,290
)
 
$
3,435

 
$
4,791

Amounts recognized in other comprehensive income or loss:
 
 
 
 
 
Actuarial loss (gain)
$
8,918

 
$
(21,143
)
 
$
1,979

Prior-service cost
—

 
(19,243
)
 
—

Reclassification of actuarial gain to net periodic benefit expense
2,111

 
1

 
—

Reclassification of prior-service credit to net periodic benefit expense
2,863

 
1,457

 
1,206

Loss (gain) recognized in other comprehensive income or loss
$
13,892

 
$
(38,928
)
 
$
3,185

Discount rate assumption used to calculate interest cost through October 31
4.50
%
 
3.60
%
 
4.30
%
Discount rate assumption used to calculate interest cost from November 1
through December 31
4.50
%
 
4.25
%
 
4.30
%
  
Expected Benefit Payments
(Dollars in thousands)
Benefit 
Payments
Year ending December 31:
 
2015
$
4,389

2016
4,582

2017
4,980

2018
5,373

2019
5,626

2020-2024
27,946

  
Changes In The Benefit Obligation And The Determination Of The Amounts Recognized
(Dollars in thousands)
2014
 
2013
Change in benefit obligation:
 
 
 
Projected benefit obligation at beginning of year
$
61,917

 
$
102,291

Service cost – benefits earned during the year
950

 
1,459

Interest cost on projected benefit obligation
2,734

 
3,434

Plan amendments
—

 
(19,243
)
Actuarial loss (gain)
8,918

 
(21,143
)
Participant contributions
2,191

 
2,009

Benefits paid
(5,677
)
 
(6,890
)
Projected and accumulated benefit obligation at end of year
$
71,033

 
$
61,917

Funded status of the plan
$
(71,033
)
 
$
(61,917
)
Amounts recognized in the balance sheet consist of :
 
 
 
Current liabilities
$
(4,389
)
 
$
(4,462
)
Long-term liabilities
(66,644
)
 
(57,455
)
Net amount recognized
$
(71,033
)
 
$
(61,917
)
Discount rate assumption as of December 31
3.75
%
 
4.50
%
  
Health-Care Cost Trend Rates Used To Determine The Benefit Obligation
 
2014
Health-care cost trend rate assumed for next year
7.00
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
4.50
%
Year that the rate reaches the ultimate trend rate
2027