BENEFIT PLANS (Tables)
|
12 Months Ended |
Dec. 31, 2015 |
Defined Benefit Plan Disclosure [Line Items] |
|
Combined Funded Status of Plans and their Reconciliation with Related Amounts Recognized in Consolidated Financial Statements |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2015
|
|
|
2014
|
|
Change in Benefit Obligation
|
|
|
|
|
|
Projected benefit obligation at beginning of year
|
$ 1,083,222
|
|
|
$ 911,700
|
|
Service cost
|
4,851
|
|
|
4,157
|
|
Interest cost
|
44,065
|
|
|
44,392
|
|
Actuarial (gain) loss
|
(63,725)
|
|
|
167,041
|
|
Benefits paid
|
(79,960)
|
|
|
(44,068)
|
|
Projected benefit obligation at end of year
|
$ 988,453
|
|
|
$ 1,083,222
|
|
Change in Fair Value of Plan Assets
|
|
|
|
|
|
Fair value of assets at beginning of year
|
$ 816,972
|
|
|
$ 756,624
|
|
Actual return on plan assets
|
(5,373)
|
|
|
98,928
|
|
Employer contribution
|
14,047
|
|
|
5,488
|
|
Benefits paid
|
(79,960)
|
|
|
(44,068)
|
|
Fair value of assets at end of year
|
$ 745,686
|
|
|
$ 816,972
|
|
Funded status
|
(242,767)
|
|
|
(266,250)
|
|
Net amount recognized
|
$ (242,767)
|
|
|
$ (266,250)
|
|
Amounts Recognized in the Consolidated
|
|
|
|
|
|
Balance Sheets
|
|
|
|
|
|
Noncurrent assets
|
$ 0
|
|
|
$ 0
|
|
Current liabilities
|
(9,106)
|
|
|
(13,719)
|
|
Noncurrent liabilities
|
(233,661)
|
|
|
(252,531)
|
|
Net amount recognized
|
$ (242,767)
|
|
|
$ (266,250)
|
|
Amounts Recognized in Accumulated
|
|
|
|
|
|
Other Comprehensive Income
|
|
|
|
|
|
Net actuarial loss
|
$ 222,580
|
|
|
$ 249,867
|
|
Prior service credit
|
(404)
|
|
|
(356)
|
|
Total amount recognized
|
$ 222,176
|
|
|
$ 249,511
|
|
|
Components Of Net Periodic Benefit Cost Amounts Recognized In Other Comprehensive Income And Weighted Average Assumptions Of Plans |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
dollars in thousands
|
2015
|
|
|
2014
|
|
|
2013
|
|
Components of Net Periodic Pension
|
|
|
|
|
|
|
|
|
Benefit Cost
|
|
|
|
|
|
|
|
|
Service cost
|
$ 4,851
|
|
|
$ 4,157
|
|
|
$ 21,904
|
|
Interest cost
|
44,065
|
|
|
44,392
|
|
|
40,995
|
|
Expected return on plan assets
|
(54,736)
|
|
|
(50,802)
|
|
|
(47,425)
|
|
Settlement charge
|
2,031
|
|
|
0
|
|
|
0
|
|
Curtailment loss
|
0
|
|
|
0
|
|
|
855
|
|
Amortization of prior service cost
|
48
|
|
|
188
|
|
|
339
|
|
Amortization of actuarial loss
|
21,641
|
|
|
11,221
|
|
|
20,429
|
|
Net periodic pension benefit cost
|
$ 17,900
|
|
|
$ 9,156
|
|
|
$ 37,097
|
|
Changes in Plan Assets and Benefit
|
|
|
|
|
|
|
|
|
Obligations Recognized in Other
|
|
|
|
|
|
|
|
|
Comprehensive Income
|
|
|
|
|
|
|
|
|
Net actuarial loss (gain)
|
$ (3,615)
|
|
|
$ 118,915
|
|
|
$ (163,205)
|
|
Prior service cost (credit)
|
0
|
|
|
0
|
|
|
(583)
|
|
Reclassification of actuarial loss to net
|
|
|
|
|
|
|
|
|
periodic pension benefit cost
|
(23,672)
|
|
|
(11,221)
|
|
|
(20,429)
|
|
Reclassification of prior service cost to net
|
|
|
|
|
|
|
|
|
periodic pension benefit cost
|
(48)
|
|
|
(188)
|
|
|
(1,194)
|
|
Amount recognized in other comprehensive
|
|
|
|
|
|
|
|
|
income
|
$ (27,335)
|
|
|
$ 107,506
|
|
|
$ (185,411)
|
|
Amount recognized in net periodic pension
|
|
|
|
|
|
|
|
|
benefit cost and other comprehensive
|
|
|
|
|
|
|
|
|
income
|
$ (9,435)
|
|
|
$ 116,662
|
|
|
$ (148,314)
|
|
Assumptions
|
|
|
|
|
|
|
|
|
Weighted-average assumptions used to
|
|
|
|
|
|
|
|
|
determine net periodic benefit cost for
|
|
|
|
|
|
|
|
|
years ended December 31
|
|
|
|
|
|
|
|
|
Discount rate
|
4.14%
|
|
|
4.91%
|
|
|
4.33%
|
|
Expected return on plan assets
|
7.50%
|
|
|
7.50%
|
|
|
7.50%
|
|
Rate of compensation increase
|
|
|
|
|
|
|
|
|
(for salary-related plans)
|
3.70%
|
|
|
3.50%
|
|
|
3.50%
|
|
Weighted-average assumptions used to
|
|
|
|
|
|
|
|
|
determine benefit obligation at
|
|
|
|
|
|
|
|
|
December 31
|
|
|
|
|
|
|
|
|
Discount rate
|
4.54%
|
|
|
4.14%
|
|
|
4.91%
|
|
Rate of compensation increase
|
|
|
|
|
|
|
|
|
(for salary-related plans)
|
3.50%
|
|
|
3.70%
|
|
|
3.50%
|
|
|
Fair values of Pension Plan Assets |
Fair Value Measurements at December 31, 2015
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
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|
in thousands
|
Level 1 1
|
|
|
Level 2 1
|
|
|
Level 3 1
|
|
|
Total
|
|
Asset Category
|
|
|
|
|
|
|
|
|
|
|
|
Debt securities
|
$ 0
|
|
|
$ 154,745
|
|
|
$ 0
|
|
|
$ 154,745
|
|
Investment funds
|
|
|
|
|
|
|
|
|
|
|
|
Commodity funds
|
0
|
|
|
14,490
|
|
|
0
|
|
|
14,490
|
|
Equity funds
|
647
|
|
|
463,416
|
|
|
0
|
|
|
464,063
|
|
Short-term funds
|
0
|
|
|
9,516
|
|
|
0
|
|
|
9,516
|
|
Venture capital and partnerships
|
0
|
|
|
0
|
|
|
102,872
|
|
|
102,872
|
|
Total pension plan assets
|
$ 647
|
|
|
$ 642,167
|
|
|
$ 102,872
|
|
|
$ 745,686
|
|
|
|
1
|
See Note 1 under the caption Fair Value Measurements for a description of the fair value hierarchy.
|
Fair Value Measurements at December 31, 2014
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
Level 1 1
|
|
|
Level 2 1
|
|
|
Level 3 1
|
|
|
Total
|
|
Asset Category
|
|
|
|
|
|
|
|
|
|
|
|
Debt securities
|
$ 0
|
|
|
$ 164,695
|
|
|
$ 0
|
|
|
$ 164,695
|
|
Investment funds
|
|
|
|
|
|
|
|
|
|
|
|
Commodity funds
|
0
|
|
|
19,480
|
|
|
0
|
|
|
19,480
|
|
Equity funds
|
457
|
|
|
506,912
|
|
|
0
|
|
|
507,369
|
|
Short-term funds
|
0
|
|
|
15,495
|
|
|
0
|
|
|
15,495
|
|
Venture capital and partnerships
|
0
|
|
|
0
|
|
|
109,933
|
|
|
109,933
|
|
Total pension plan assets
|
$ 457
|
|
|
$ 706,582
|
|
|
$ 109,933
|
|
|
$ 816,972
|
|
|
|
1
|
See Note 1 under the caption Fair Value Measurements for a description of the fair value hierarchy.
|
|
Reconciliation of Fair Value Measurements of Pension Plan Assets Using Significant Unobservable Inputs ( Level 3) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Venture
|
|
|
|
|
|
Capital and
|
|
|
in thousands
|
|
|
Partnerships
|
|
|
Balance at December 31, 2013
|
|
|
$ 88,482
|
|
|
Total gains (losses) for 2014 1
|
|
|
34,071
|
|
|
Purchases, sales and settlements, net
|
|
|
(12,940)
|
|
|
Transfers into (out of) Level 3
|
|
|
320
|
|
|
Balance at December 31, 2014
|
|
|
$ 109,933
|
|
|
Total gains (losses) for 2015 1
|
|
|
5,186
|
|
|
Purchases, sales and settlements, net
|
|
|
(12,247)
|
|
|
Transfers into (out of) Level 3
|
|
|
0
|
|
|
Balance at December 31, 2015
|
|
|
$ 102,872
|
|
|
|
|
1
|
The total gains (losses) for 2015 and 2014 include $47 thousand and $29,329 thousand, respectively, in unrealized gains related to assets still held as of their respective year ends.
|
|
Employer Contributions for Plan |
|
|
|
|
|
|
|
|
|
|
in thousands
|
Pension
|
|
Employer Contributions
|
|
|
2013
|
$ 4,855
|
|
2014
|
5,488
|
|
2015
|
14,047
|
|
2016 (estimated)
|
9,107
|
|
|
Benefit Payments Which Reflect Expected Future Service, Expected to be Paid |
|
|
|
|
|
|
|
|
|
|
in thousands
|
Pension
|
|
Estimated Future Benefit Payments
|
|
|
2016
|
$ 51,286
|
|
2017
|
52,434
|
|
2018
|
55,527
|
|
2019
|
56,835
|
|
2020
|
58,161
|
|
2021-2025
|
305,043
|
|
|
Other Postretirement Benefit Plans, Defined Benefit [Member] |
|
Defined Benefit Plan Disclosure [Line Items] |
|
Combined Funded Status of Plans and their Reconciliation with Related Amounts Recognized in Consolidated Financial Statements |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
in thousands
|
2015
|
|
|
2014
|
|
Change in Benefit Obligation
|
|
|
|
|
|
Projected benefit obligation at beginning of year
|
$ 85,336
|
|
|
$ 92,888
|
|
Service cost
|
1,894
|
|
|
2,146
|
|
Interest cost
|
2,485
|
|
|
3,297
|
|
Liability reduction from curtailment
|
0
|
|
|
(2,639)
|
|
Actuarial gain
|
(35,195)
|
|
|
(2,617)
|
|
Benefits paid
|
(5,915)
|
|
|
(7,739)
|
|
Projected benefit obligation at end of year
|
$ 48,605
|
|
|
$ 85,336
|
|
Change in Fair Value of Plan Assets
|
|
|
|
|
|
Fair value of assets at beginning of year
|
$ 0
|
|
|
$ 0
|
|
Actual return on plan assets
|
0
|
|
|
0
|
|
Fair value of assets at end of year
|
$ 0
|
|
|
$ 0
|
|
Funded status
|
$ (48,605)
|
|
|
$ (85,336)
|
|
Net amount recognized
|
$ (48,605)
|
|
|
$ (85,336)
|
|
Amounts Recognized in the Consolidated
|
|
|
|
|
|
Balance Sheets
|
|
|
|
|
|
Current liabilities
|
$ (6,287)
|
|
|
$ (8,964)
|
|
Noncurrent liabilities
|
(42,318)
|
|
|
(76,372)
|
|
Net amount recognized
|
$ (48,605)
|
|
|
$ (85,336)
|
|
Amounts Recognized in Accumulated
|
|
|
|
|
|
Other Comprehensive Income
|
|
|
|
|
|
Net actuarial (gain) loss
|
$ (24,325)
|
|
|
$ 10,921
|
|
Prior service credit
|
(23,928)
|
|
|
(28,160)
|
|
Total amount recognized
|
$ (48,253)
|
|
|
$ (17,239)
|
|
|
Components Of Net Periodic Benefit Cost Amounts Recognized In Other Comprehensive Income And Weighted Average Assumptions Of Plans |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
dollars in thousands
|
2015
|
|
|
2014
|
|
|
2013
|
|
Components of Net Periodic Postretirement
|
|
|
|
|
|
|
|
|
Benefit Cost
|
|
|
|
|
|
|
|
|
Service cost
|
$ 1,894
|
|
|
$ 2,146
|
|
|
$ 2,830
|
|
Interest cost
|
2,485
|
|
|
3,297
|
|
|
3,260
|
|
Curtailment gain
|
0
|
|
|
(3,832)
|
|
|
0
|
|
Amortization of prior service credit
|
(4,232)
|
|
|
(4,327)
|
|
|
(4,863)
|
|
Amortization of actuarial loss
|
37
|
|
|
227
|
|
|
1,372
|
|
Net periodic postretirement benefit cost (credit)
|
$ 184
|
|
|
$ (2,489)
|
|
|
$ 2,599
|
|
Changes in Plan Assets and Benefit
|
|
|
|
|
|
|
|
|
Obligations Recognized in Other
|
|
|
|
|
|
|
|
|
Comprehensive Income
|
|
|
|
|
|
|
|
|
Net actuarial (gain) loss
|
$ (35,209)
|
|
|
$ (5,256)
|
|
|
$ (20,444)
|
|
Reclassification of actuarial loss to net
|
|
|
|
|
|
|
|
|
periodic postretirement benefit cost
|
(37)
|
|
|
(227)
|
|
|
(1,372)
|
|
Reclassification of prior service credit to net
|
|
|
|
|
|
|
|
|
periodic postretirement benefit cost
|
4,232
|
|
|
8,159
|
|
|
4,863
|
|
Amount recognized in other comprehensive
|
|
|
|
|
|
|
|
|
income
|
$ (31,014)
|
|
|
$ 2,676
|
|
|
$ (16,953)
|
|
Amount recognized in net periodic
|
|
|
|
|
|
|
|
|
postretirement benefit cost and other
|
|
|
|
|
|
|
|
|
comprehensive income
|
$ (30,830)
|
|
|
$ 187
|
|
|
$ (14,354)
|
|
Assumptions
|
|
|
|
|
|
|
|
|
Assumed Healthcare Cost Trend Rates
|
|
|
|
|
|
|
|
|
at December 31
|
|
|
|
|
|
|
|
|
Healthcare cost trend rate assumed
|
|
|
|
|
|
|
|
|
for next year
|
n/a
|
|
|
7.50%
|
|
|
7.50%
|
|
Rate to which the cost trend rate gradually
|
|
|
|
|
|
|
|
|
declines
|
n/a
|
|
|
5.00%
|
|
|
5.00%
|
|
Year that the rate reaches the rate it is
|
|
|
|
|
|
|
|
|
assumed to maintain
|
n/a
|
|
|
2025
|
|
|
2019
|
|
Weighted-average assumptions used to
|
|
|
|
|
|
|
|
|
determine net periodic benefit cost for
|
|
|
|
|
|
|
|
|
years ended December 31
|
|
|
|
|
|
|
|
|
Discount rate
|
3.50%
|
|
|
4.10%
|
|
|
3.30%
|
|
Weighted-average assumptions used to
|
|
|
|
|
|
|
|
|
determine benefit obligation at
|
|
|
|
|
|
|
|
|
December 31
|
|
|
|
|
|
|
|
|
Discount rate
|
3.69%
|
|
|
3.50%
|
|
|
4.10%
|
|
|
Employer Contributions for Plan |
|
|
|
|
|
|
|
|
|
|
in thousands
|
Postretirement
|
|
Employer Contributions
|
|
|
2013
|
$ 6,258
|
|
2014
|
7,739
|
|
2015
|
5,915
|
|
2016 (estimated)
|
6,287
|
|
|
Benefit Payments Which Reflect Expected Future Service, Expected to be Paid |
|
|
|
|
|
|
|
|
|
|
in thousands
|
Postretirement
|
|
Estimated Future Benefit Payments
|
|
|
2016
|
$ 6,287
|
|
2017
|
5,856
|
|
2018
|
5,623
|
|
2019
|
5,415
|
|
2020
|
5,152
|
|
2021–2025
|
19,229
|
|
|
Contributions by Participants to Postretirement Benefit Plans |
|
|
|
|
|
|
|
|
|
|
in thousands
|
Postretirement
|
|
Participants Contributions
|
|
|
2013
|
$ 2,022
|
|
2014
|
1,873
|
|
2015
|
2,031
|
|
|