XML 72 R50.htm IDEA: XBRL DOCUMENT
v3.20.4

Employee Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of amounts recognized in balance sheet | Changes in benefit obligation and plan assets and amounts recognized in the Consolidated Balance Sheets at December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2020 | 2019 | 2020 | 2019
Change in benefit obligation: | (In thousands)
Benefit obligation at beginning of year | $ | 421,166 |  | $ | 391,602 |  | $ | 83,614 |  | $ | 81,201 |
Service cost | — |  | — |  | 1,532 |  | 1,142 |
Interest cost | 12,093 |  | 15,225 |  | 2,437 |  | 2,986 |
Plan participants' contributions | — |  | — |  | 752 |  | 1,040 |
Actuarial loss | 27,737 |  | 40,219 |  | 2,203 |  | 2,632 |
Benefits paid | (23,636) |  | (25,880) |  | (4,383) |  | (5,387) |
Benefit obligation at end of year | 437,360 |  | 421,166 |  | 86,155 |  | 83,614 |
Change in net plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 365,264 |  | 307,809 |  | 94,587 |  | 82,516 |
Actual return on plan assets | 42,206 |  | 58,409 |  | 10,249 |  | 15,731 |
Employer contribution | — |  | 24,926 |  | 434 |  | 687 |
Plan participants' contributions | — |  | — |  | 752 |  | 1,040 |
Benefits paid | (23,636) |  | (25,880) |  | (4,383) |  | (5,387) |
Fair value of net plan assets at end of year | 383,834 |  | 365,264 |  | 101,639 |  | 94,587 |
Funded status - over (under) | $ | (53,526) |  | $ | (55,902) |  | $ | 15,484 |  | $ | 10,973 |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent assets - other | $ | — |  | $ | — |  | $ | 36,769 |  | 30,475 |
Other accrued liabilities | — |  | — |  | 622 |  | 647 |
Noncurrent liabilities - other | 53,526 |  | 55,902 |  | 20,663 |  | 18,855 |
Benefit obligation assets (liabilities) - net amount recognized | $ | (53,526) |  | $ | (55,902) |  | $ | 15,484 |  | $ | 10,973 |
Amounts recognized in accumulated other comprehensive loss: |  |  |  |
Actuarial loss | $ | 27,527 |  | $ | 27,748 |  | $ | 5,557 |  | $ | 6,118 |
Prior service credit | — |  | — |  | (634) |  | (731) |
Total | $ | 27,527 |  | $ | 27,748 |  | $ | 4,923 |  | $ | 5,387 |
Amounts recognized in regulatory assets or liabilities: |  |  |  |
Actuarial (gain) loss | $ | 154,013 |  | $ | 155,484 |  | $ | (8,228) |  | $ | (4,450) |
Prior service credit | — |  | — |  | (6,808) |  | (8,109) |
Total | $ | 154,013 |  | $ | 155,484 |  | $ | (15,036) |  | $ | (12,559) |
The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of plan assets | The pension plans all have accumulated benefit obligations in excess of plan assets. The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for these plans at December 31 were as follows:
| 2020 |  | 2019 |
| (In thousands)
Projected benefit obligation | $ | 437,360 |  | $ | 421,166 |
Accumulated benefit obligation | $ | 437,360 |  | $ | 421,166 |
Fair value of plan assets | $ | 383,834 |  | $ | 365,264 |
The projected benefit obligation and accumulated benefit obligation for these plans at December 31 were as follows:
| 2020 |  | 2019 |
| (In thousands)
Projected benefit obligation | $ | 101,242 |  | $ | 99,245 |
Accumulated benefit obligation | $ | 101,242 |  | $ | 99,245 |
Components of net periodic benefit cost | The components of net periodic benefit cost (credit), other than the service cost component, are included in other income on the Consolidated Statements of Income. These components related to the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2020 | 2019 | 2018 | 2020 | 2019 | 2018
Components of net periodic benefit cost (credit): | (In thousands)
Service cost | $ | — |  | $ | — |  | $ | — |  | $ | 1,532 |  | $ | 1,142 |  | $ | 1,494 |
Interest cost | 12,093 |  | 15,225 |  | 14,591 |  | 2,437 |  | 2,986 |  | 2,899 |
Expected return on assets | (19,949) |  | (18,236) |  | (20,753) |  | (5,019) |  | (4,804) |  | (4,866) |
Amortization of prior service credit | — |  | — |  | — |  | (1,398) |  | (1,398) |  | (1,394) |
Recognized net actuarial loss | 7,172 |  | 5,548 |  | 7,005 |  | 287 |  | 353 |  | 640 |
Net periodic benefit cost (credit), including amount capitalized | (684) |  | 2,537 |  | 843 |  | (2,161) |  | (1,721) |  | (1,227) |
Less amount capitalized | — |  | — |  | — |  | 156 |  | 113 |  | 153 |
Net periodic benefit cost (credit) | (684) |  | 2,537 |  | 843 |  | (2,317) |  | (1,834) |  | (1,380) |
Other changes in plan assets and benefit obligations recognized in accumulated comprehensive loss: |  |  |  |  |  |
Net (gain) loss | 934 |  | (144) |  | 991 |  | (259) |  | (127) |  | (1,735) |
Amortization of actuarial loss | (1,155) |  | (904) |  | (1,084) |  | (306) |  | (110) |  | (354) |
Amortization of prior service (cost) credit | — |  | — |  | — |  | 101 |  | 100 |  | (220) |
Total recognized in accumulated other comprehensive loss | (221) |  | (1,048) |  | (93) |  | (464) |  | (137) |  | (2,309) |
Other changes in plan assets and benefit obligations recognized in regulatory assets or liabilities: |  |  |  |  |  |
Net (gain) loss | 4,546 |  | 189 |  | 8,263 |  | (3,793) |  | (8,168) |  | (732) |
Amortization of actuarial gain (loss) | (6,017) |  | (4,644) |  | (5,921) |  | 19 |  | (242) |  | (286) |
Amortization of prior service credit | — |  | — |  | — |  | 1,297 |  | 1,297 |  | 1,614 |
Total recognized in regulatory assets or liabilities | (1,471) |  | (4,455) |  | 2,342 |  | (2,477) |  | (7,113) |  | 596 |
Total recognized in net periodic benefit cost (credit), accumulated other comprehensive loss and regulatory assets or liabilities | $ | (2,376) |  | $ | (2,966) |  | $ | 3,092 |  | $ | (5,258) |  | $ | (9,084) |  | $ | (3,093) |
The components of net periodic benefit cost are included in other income on the Consolidated Statements of Income. These components related to the Company's nonqualified defined benefit plans for the years ended December 31 were as follows:
| 2020 |  | 2019 |  | 2018 |
| (In thousands)
Components of net periodic benefit cost: |  |  |
Service cost | $ | 58 |  | $ | 109 |  | $ | 185 |
Interest cost | 2,606 |  | 3,473 |  | 3,157 |
Recognized net actuarial loss | 1,192 |  | 764 |  | 1,047 |
Net periodic benefit cost | $ | 3,856 |  | $ | 4,346 |  | $ | 4,389 |
Weighted average assumptions used to determine benefit obligations and net periodic benefit costs | Weighted average assumptions used to determine benefit obligations at December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2020 |  | 2019 |  | 2020 |  | 2019 |
Discount rate | 2.30 | % | 2.96 | % | 2.30 | % | 3.00 | %
Expected return on plan assets | 6.00 | % | 6.25 | % | 5.50 | % | 5.75 | %
Rate of compensation increase | N/A | N/A | 3.00 | % | 3.00 | %
Weighted average assumptions used to determine net periodic benefit cost (credit) for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2020 | 2019 | 2020 | 2019
Discount rate | 2.96 | % | 4.03 | % | 3.00 | % | 4.05 | %
Expected return on plan assets | 6.25 | % | 6.25 | % | 5.75 | % | 5.75 | %
Rate of compensation increase | N/A | N/A | 3.00 | % | 3.00 | %
Weighted average assumptions used at December 31 were as follows:
| 2020 |  | 2019 |
Benefit obligation discount rate | 1.97 | % | 2.73 | %
Benefit obligation rate of compensation increase | N/A | N/A
Net periodic benefit cost discount rate | 2.73 | % | 3.86 | %
Net periodic benefit cost rate of compensation increase | N/A | N/A
Health care rate assumptions for the Company's other postretirement benefit plans | Health care rate assumptions for the Company's other postretirement benefit plans as of December 31 were as follows:
| 2020 |  | 2019
Health care trend rate assumed for next year | 7.0 | % | 7.1 | % | – | 7.4 | %
Health care cost trend rate - ultimate | 4.5 | % |  |  | 4.5 | %
Year in which ultimate trend rate achieved | 2031 |  |  | 2024
Assumed health care cost trend rates | Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one percentage point change in the assumed health care cost trend rates would have had the following effects at December 31, 2020:
| 1 Percentage Point Increase | 1 Percentage Point Decrease
| (In thousands)
Effect on total of service and interest cost components | $ | 182 |  | $ | (154) |
Effect on postretirement benefit obligation | $ | 3,846 |  | $ | (3,304) |
Benefit payments expected to be paid | The following benefit payments, which reflect future service, as appropriate, and expected Medicare Part D subsidies at December 31, 2020, are as follows:
Years | Pension Benefits | Other Postretirement Benefits | Expected Medicare Part D Subsidy
|  | (In thousands) |
2021 | $ | 24,455 |  | $ | 5,404 |  | $ | 95 |
2022 | 24,507 |  | 5,437 |  | 89 |
2023 | 24,733 |  | 5,424 |  | 83 |
2024 | 24,835 |  | 5,377 |  | 75 |
2025 | 24,713 |  | 5,277 |  | 70 |
2026-2030 | 119,191 |  | 25,949 |  | 252 |
The amount of future benefit payments for the unfunded, nonqualified defined benefit plans at December 31, 2020, are expected to aggregate as follows:
| 2021 | 2022 | 2023 | 2024 | 2025 | 2026-2030
| (In thousands)
Nonqualified benefits | $ | 7,693 |  | $ | 6,957 |  | $ | 6,933 |  | $ | 7,299 |  | $ | 7,253 |  | $ | 33,938 |
The fair value of the pension and postretirement net plan assets by class | The fair value of the Company's pension plans' assets (excluding cash) by class were as follows:
| Fair Value Measurements at December 31, 2020, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2020
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 7,841 |  | $ | — |  | $ | 7,841 |
Equity securities: |  |  |  |
U.S. companies | 12,844 |  | — |  | — |  | 12,844 |
International companies | — |  | 1,727 |  | — |  | 1,727 |
Collective and mutual funds* | 177,397 |  | 55,788 |  | — |  | 233,185 |
Corporate bonds | — |  | 92,809 |  | — |  | 92,809 |
Municipal bonds | — |  | 10,126 |  | — |  | 10,126 |
U.S. Government securities | 11,177 |  | 2,695 |  | — |  | 13,872 |
Investments measured at net asset value | — |  | — |  | — |  | 11,430 |
Total assets measured at fair value | $ | 201,418 |  | $ | 170,986 |  | $ | — |  | $ | 383,834 |
*Collective and mutual funds invest approximately 36 percent in corporate bonds, 24 percent in common stock of international companies, 18 percent in common stock of large-cap U.S. companies, 8 percent in cash equivalents, 5 percent in U.S. Government securities and 9 percent in other investments.
| Fair Value Measurements at December 31, 2019, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2019
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 26,166 |  | $ | — |  | $ | 26,166 |
Equity securities: |  |  |  |
U.S. companies | 14,457 |  | — |  | — |  | 14,457 |
International companies | — |  | 938 |  | — |  | 938 |
Collective and mutual funds* | 160,906 |  | 58,894 |  | — |  | 219,800 |
Corporate bonds | — |  | 80,768 |  | — |  | 80,768 |
Municipal bonds | — |  | 11,828 |  | — |  | 11,828 |
U.S. Government securities | 7,296 |  | 2,082 |  | — |  | 9,378 |
Total assets measured at fair value | $ | 182,659 |  | $ | 180,676 |  | $ | — |  | $ | 363,335 |
*Collective and mutual funds invest approximately 29 percent in common stock of international companies, 21 percent in common stock of large-cap U.S. companies, 18 percent in U.S. Government securities, 9 percent in corporate bonds, 6 percent in cash equivalents and 17 percent in other investments. The fair value of the Company's other postretirement benefit plans' assets (excluding cash) by asset class were as follows:
| Fair Value Measurements at December 31, 2020, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2020
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 3,517 |  | $ | — |  | $ | 3,517 |
Equity securities: |  |  |  |
U.S. companies | 1,850 |  | — |  | — |  | 1,850 |
International companies | — |  | 2 |  | — |  | 2 |
Collective and mutual funds (a) | 10 |  | 147 |  | — |  | 157 |
Insurance contract (b) | — |  | 96,103 |  | — |  | 96,103 |
Investments measured at net asset value | — |  | — |  | — |  | 10 |
Total assets measured at fair value | $ | 1,860 |  | $ | 99,769 |  | $ | — |  | $ | 101,639 |
(a)Collective and mutual funds invest approximately 36 percent in corporate bonds, 24 percent in common stock of international companies, 18 percent in common stock of large-cap U.S. companies, 8 percent in cash equivalents, 5 percent in U.S. Government securities and 9 percent in other investments. (b)The insurance contract invests approximately 67 percent in corporate bonds, 12 percent in U.S. Government securities, 10 percent in common stock of large-cap U.S. companies, 4 percent in common stock of small-cap U.S. companies, 1 percent in cash equivalents and 6 percent in other investments.
| Fair Value Measurements at December 31, 2019, Using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Balance at December 31, 2019
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 4,017 |  | $ | — |  | $ | 4,017 |
Equity securities: |  |  |  |
U.S. companies | 2,073 |  | — |  | — |  | 2,073 |
International companies | — |  | 1 |  | — |  | 1 |
Collective and mutual funds (a) | 10 |  | 221 |  | — |  | 231 |
Insurance contract (b) | — |  | 88,265 |  | — |  | 88,265 |
Total assets measured at fair value | $ | 2,083 |  | $ | 92,504 |  | $ | — |  | $ | 94,587 |
(a)Collective and mutual funds invest approximately 29 percent in common stock of international companies, 21 percent in common stock of large-cap U.S. companies, 18 percent in U.S. Government securities, 9 percent in corporate bonds, 6 percent in cash equivalents and 17 percent in other investments. (b)The insurance contract invests approximately 50 percent in corporate bonds, 25 percent in common stock of large-cap U.S. companies, 7 percent in U.S. Government securities, 7 percent in common stock of small-cap U.S. companies and 11 percent in other investments. The amount of investments that the Company anticipates using to satisfy obligations under these plans at December 31 was as follows:
| 2020 |  | 2019 |
| (In thousands)
Investments |  |
Insurance contract* | $ | 100,104 |  | $ | 87,009 |
Life insurance** | 39,779 |  | 38,659 |
Other | 8,917 |  | 8,450 |
Total investments | $ | 148,800 |  | $ | 134,118 |
* For more information on the insurance contract, see Note 8. ** Investments of life insurance are carried on plan participants (payable upon the employee's death).
Schedule of Multiemployer Plans [Table Text Block] |
| EIN/Pension Plan Number | Pension Protection Act Zone Status | FIP/RP Status Pending/Implemented | Contributions | Surcharge Imposed | Expiration Date of Collective Bargaining Agreement |
Pension Fund | 2020 | 2019 | 2020 |  | 2019 |  | 2018 |  |
|  |  |  |  | (In thousands) |  |  |
Alaska Laborers-Employers Retirement Fund | 91-6028298-001 | Yellow as of 6/30/2020 | Yellow as of 6/30/2019 | Implemented | $ | 828 |  | $ | 815 |  | $ | 732 |  | No | 12/31/2020 | *
Construction Industry and Laborers Joint Pension Trust for So Nevada, Plan A | 88-0135695-001 | Red | Red | Implemented | 515 |  | 544 |  | 346 |  | No | 6/30/2023 |
Edison Pension Plan | 93-6061681-001 | Green | Green | No | 16,121 |  | 12,252 |  | 12,111 |  | No | 12/31/2021 |
IBEW Local 212 Pension Trust | 31-6127280-001 | Green as of 4/30/2020 | Green as of 4/30/2019 | No | 1,521 |  | 1,110 |  | 1,341 |  | No | 6/1/2025 |
IBEW Local 357 Pension Plan A | 88-6023284-001 | Green | Green | No | 9,913 |  | 10,162 |  | 3,460 |  | No | 5/31/2021 |
IBEW Local 38 Pension Plan | 34-6574238-001 | Red as of 4/30/2020 | Yellow as of 4/30/2019 | Implemented | 140 |  | 158 |  | 116 |  | No | 4/23/2023 |
IBEW Local 648 Pension Plan | 31-6134845-001 | Yellow as of 2/28/2020 | Yellow as of 2/28/2019 | Implemented | 526 |  | 728 |  | 2,175 |  | No | 8/29/2021 |
IBEW Local 82 Pension Plan | 31-6127268-001 | Green as of 6/30/2020 | Green as of 6/30/2019 | No | 1,373 |  | 1,662 |  | 1,569 |  | No | 12/3/2023 |
Idaho Plumbers and Pipefitters Pension Plan | 82-6010346-001 | Green as of 5/31/2020 | Green as of 5/31/2019 | No | 1,370 |  | 1,307 |  | 1,247 |  | No | 3/31/2023 |
Minnesota Teamsters Construction Division Pension Fund | 41-6187751-001 | Green as of 11/30/2019 | Green as of 11/30/2018 | No | 663 |  | 673 |  | 740 |  | No | 4/30/2021 |
National Automatic Sprinkler Industry Pension Fund | 52-6054620-001 | Red | Red | Implemented | 954 |  | 1,074 |  | 738 |  | No | 3/31/2021- 7/31/2024 |
National Electrical Benefit Fund | 53-0181657-001 | Green | Green | No | 14,484 |  | 12,679 |  | 8,468 |  | No | 12/31/2021- 8/30/2025 |
Pension Trust Fund for Operating Engineers | 94-6090764-001 | Yellow | Yellow | Implemented | 2,680 |  | 2,598 |  | 2,403 |  | No | 6/15/2022- 6/30/2023 |
Sheet Metal Workers Pension Plan of Southern CA, AZ, and NV | 95-6052257-001 | Yellow | Yellow | Implemented | 3,255 |  | 2,119 |  | 1,774 |  | No | 6/30/2024 |
Southwest Marine Pension Trust | 95-6123404-001 | Red | Red | Implemented | 170 |  | 132 |  | 81 |  | No | 1/31/2024 |
Other funds |  |  |  |  | 30,931 |  | 24,512 |  | 21,421 |  |  |  |
Total contributions | $ | 85,444 |  | $ | 72,525 |  | $ | 58,722 |  |  |  |
* Plan includes contributions required by collective bargaining agreements which have expired, but contain provisions automatically renewing their terms in the absence of a subsequent negotiated agreement. The Company was listed in the plans' Forms 5500 as providing more than 5 percent of the total contributions for the following plans and plan years:
Pension Fund | Year Contributions to Plan Exceeded More Than 5 Percent of Total Contributions (as of December 31 of the Plan's Year-End)
Edison Pension Plan | 2019 and 2018
IBEW Local 82 Pension Plan | 2019 and 2018
IBEW Local 124 Pension Trust Fund | 2019 and 2018
IBEW Local 212 Pension Trust Fund | 2019 and 2018
IBEW Local 357 Pension Plan A | 2019 and 2018
IBEW Local 648 Pension Plan | 2019 and 2018
IBEW Local 683 Pension Fund Pension Plan | 2019
IBEW Local Union No 226 Open End Pension Fund | 2019 and 2018
Idaho Plumbers and Pipefitters Pension Plan | 2019 and 2018
International Union of Operating Engineers Local 701 Pension Trust Fund | 2019 and 2018
Minnesota Teamsters Construction Division Pension Fund | 2019 and 2018
Pension and Retirement Plan of Plumbers and Pipefitters Local 525 | 2019 and 2018

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about multiemployer plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
Name: | us-gaap_ScheduleOfMultiemployerPlansTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration