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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of amounts recognized in balance sheet | Changes in benefit obligation and plan assets for the years ended December 31, 2015 and 2014, and amounts recognized in the Consolidated Balance Sheets at December 31, 2015 and 2014, were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |
| (In thousands)
Change in benefit obligation: |  |  |  |
Benefit obligation at beginning of year | $ | 475,337 |  | $ | 402,772 |  | $ | 99,012 |  | $ | 81,726 |
Service cost | 86 |  | 129 |  | 1,816 |  | 1,518 |
Interest cost | 17,141 |  | 17,682 |  | 3,607 |  | 3,521 |
Plan participants' contributions | — |  | — |  | 1,408 |  | 1,399 |
Actuarial (gain) loss | (24,875 | ) | 80,520 |  | (5,873 | ) | 18,024 |
Benefits paid | (24,729 | ) | (25,766 | ) | (7,236 | ) | (7,176 | )
Benefit obligation at end of year | 442,960 |  | 475,337 |  | 92,734 |  | 99,012 |
Change in net plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 354,363 |  | 334,844 |  | 87,586 |  | 84,543 |
Actual gain (loss) on plan assets | (10,879 | ) | 24,500 |  | 258 |  | 7,527 |
Employer contribution | 13,912 |  | 20,785 |  | 577 |  | 1,293 |
Plan participants' contributions | — |  | — |  | 1,408 |  | 1,399 |
Benefits paid | (24,729 | ) | (25,766 | ) | (7,236 | ) | (7,176 | )
Fair value of net plan assets at end of year | 332,667 |  | 354,363 |  | 82,593 |  | 87,586 |
Funded status - under | $ | (110,293 | ) | $ | (120,974 | ) | $ | (10,141 | ) | $ | (11,426 | )
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |  |
Other assets (noncurrent) | $ | — |  | $ | — |  | $ | 5,095 |  | $ | 4,345 |
Other accrued liabilities (current) | — |  | — |  | (421 | ) | (322 | )
Other liabilities (noncurrent) | (110,293 | ) | (120,974 | ) | (14,815 | ) | (15,449 | )
Net amount recognized | $ | (110,293 | ) | $ | (120,974 | ) | $ | (10,141 | ) | $ | (11,426 | )
Amounts recognized in accumulated other comprehensive (income) loss consist of: |  |  |  |  |  |  |  |
Actuarial loss | $ | 208,671 |  | $ | 207,430 |  | $ | 22,484 |  | $ | 25,779 |
Prior service cost (credit) | — |  | 294 |  | (14,374 | ) | (15,744 | )
Total | $ | 208,671 |  | $ | 207,724 |  | $ | 8,110 |  | $ | 10,035 |
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:
| 2015 |  | 2014 |
| (In thousands)
Projected benefit obligation | $ | 442,960 |  | $ | 475,337 |
Accumulated benefit obligation | $ | 442,960 |  | $ | 475,337 |
Fair value of plan assets | $ | 332,667 |  | $ | 354,363 |
Components of net periodic benefit cost | Components of net periodic benefit cost (credit) for the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013 |
| (In thousands)
Components of net periodic benefit cost (credit): |  |  |  |  |  |
Service cost | $ | 86 |  | $ | 129 |  | $ | 155 |  | $ | 1,816 |  | $ | 1,518 |  | $ | 1,675 |
Interest cost | 17,141 |  | 17,682 |  | 16,249 |  | 3,607 |  | 3,521 |  | 3,215 |
Expected return on assets | (22,254 | ) | (21,218 | ) | (19,917 | ) | (4,795 | ) | (4,617 | ) | (4,343 | )
Amortization of prior service cost (credit) | 36 |  | 71 |  | 71 |  | (1,371 | ) | (1,393 | ) | (1,457 | )
Recognized net actuarial loss | 7,016 |  | 4,869 |  | 7,173 |  | 1,960 |  | 649 |  | 1,814 |
Curtailment loss | 258 |  | — |  | — |  | — |  | — |  | — |
Net periodic benefit cost (credit), including amount capitalized | 2,283 |  | 1,533 |  | 3,731 |  | 1,217 |  | (322 | ) | 904 |
Less amount capitalized | 316 |  | 388 |  | 727 |  | 120 |  | (21 | ) | 164 |
Net periodic benefit cost (credit) | 1,967 |  | 1,145 |  | 3,004 |  | 1,097 |  | (301 | ) | 740 |
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive (income) loss: |  |  |  |  |  |  |  |  |  |  |  |
Net (gain) loss | 8,257 |  | 77,238 |  | (60,173 | ) | (1,336 | ) | 15,114 |  | (30,461 | )
Amortization of actuarial loss | (7,016 | ) | (4,869 | ) | (7,173 | ) | (1,960 | ) | (649 | ) | (1,814 | )
Amortization of prior service (cost) credit | (294 | ) | (71 | ) | (71 | ) | 1,371 |  | 1,393 |  | 1,457 |
Total recognized in accumulated other comprehensive (income) loss | 947 |  | 72,298 |  | (67,417 | ) | (1,925 | ) | 15,858 |  | (30,818 | )
Total recognized in net periodic benefit cost (credit) and accumulated other comprehensive (income) loss | $ | 2,914 |  | $ | 73,443 |  | $ | (64,413 | ) | $ | (828 | ) | $ | 15,557 |  | $ | (30,078 | )
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
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Discount rate | 4.00 | % | 3.70 | % | 4.06 | % | 3.74 | %
Expected return on plan assets | 6.75 | % | 7.00 | % | 5.75 | % | 6.00 | %
Rate of compensation increase | N/A |  | N/A |  | 3.00 | % | 3.00 | %
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31 were as follows:
| Pension Benefits | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Discount rate | 3.70 | % | 4.53 | % | 3.74 | % | 4.48 | %
Expected return on plan assets | 7.00 | % | 7.00 | % | 6.00 | % | 6.00 | %
Rate of compensation increase | N/A |  | N/A |  | 3.00 | % | 3.00 | %
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:
|  |  | 2015 |  |  |  | 2014 |
Health care trend rate assumed for next year | 4.0 | % | – | 8.0 | % | 4.0 | % | – | 7.0 | %
Health care cost trend rate - ultimate | 5.0 | % | – | 6.0 | % | 5.0 | % | – | 6.0 | %
Year in which ultimate trend rate achieved |  |  | 2021 |  |  |  |  | 2017 |
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, 2015:
| 1 Percentage Point Increase |  | 1 Percentage Point Decrease |
| (In thousands)
Effect on total of service and interest cost components | $ | 203 |  | $ | (169 | )
Effect on postretirement benefit obligation | $ | 4,006 |  | $ | (3,407 | )
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, 2015, 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, 2015 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 8,379 |  | $ | — |  | $ | 8,379 |
Equity securities: |  |  |  |  |
U.S. companies | 15,135 |  | — |  | — |  | 15,135 |
International companies | 2,332 |  | — |  | — |  | 2,332 |
Collective and mutual funds* | 154,400 |  | 63,568 |  | — |  | 217,968 |
Corporate bonds | — |  | 62,145 |  | — |  | 62,145 |
Municipal bonds | — |  | 11,680 |  | — |  | 11,680 |
U.S. Government securities | 5,288 |  | 6,823 |  | — |  | 12,111 |
Total assets measured at fair value | $ | 177,155 |  | $ | 152,595 |  | $ | — |  | $ | 329,750 |
* | Collective and mutual funds invest approximately 19 percent in common stock of large-cap U.S. companies, 6 percent in common stock of mid-cap U.S. companies, 16 percent in corporate bonds, 29 percent in common stock of international companies, 16 percent in cash equivalents and 14 percent in other investments.
| Fair Value Measurements at December 31, 2014, 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, 2014 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 5,631 |  | $ | — |  | $ | 5,631 |
Equity securities: |  |  |  |  |
U.S. companies | 39,077 |  | — |  | — |  | 39,077 |
International companies | 5,189 |  | — |  | — |  | 5,189 |
Collective and mutual funds* | 132,403 |  | 77,449 |  | — |  | 209,852 |
Corporate bonds | — |  | 59,471 |  | — |  | 59,471 |
Municipal bonds | — |  | 10,462 |  | — |  | 10,462 |
U.S. Government securities | 15,001 |  | 6,849 |  | — |  | 21,850 |
Total assets measured at fair value | $ | 191,670 |  | $ | 159,862 |  | $ | — |  | $ | 351,532 |
* | Collective and mutual funds invest approximately 13 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Government securities, 23 percent in corporate bonds, 33 percent in common stock of international companies and 18 percent in other investments.
The estimated fair values of the Company's other postretirement benefit plans' assets are determined using the market approach. The estimated fair value of the other postretirement benefit plans' Level 2 cash equivalents is valued at the net asset value of shares held at year end, based on published market quotations on active markets, or using other known sources including pricing from outside sources. Units of this fund can be redeemed on a daily basis at their net asset value and have no redemption restrictions. The assets are invested in high-quality, short-term money market instruments that consist of municipal obligations. There are no unfunded commitments related to this fund. The estimated fair value of the other postretirement benefit plans' Level 1 equity securities is based on the closing price reported on the active market on which the individual securities are traded. The estimated fair value of the other postretirement benefit plans' Level 2 insurance contract is based on contractual cash surrender values that are determined primarily by investments in managed separate accounts of the insurer. These amounts approximate fair value. The managed separate accounts are valued based on other observable inputs or corroborated market data. Though the Company believes the methods used to estimate fair value are consistent with those used by other market participants, the use of other methods or assumptions could result in a different estimate of fair value. For the years ended December 31, 2015 and 2014, there were no transfers between Levels 1 and 2. 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, 2015, 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, 2015 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 3,261 |  | $ | — |  | $ | 3,261 |
Equity securities: |  |  |  |  |  |  |  |
U.S. companies | 2,274 |  | — |  | — |  | 2,274 |
International companies | 9 |  | — |  | — |  | 9 |
Insurance contract* | — |  | 77,044 |  | — |  | 77,044 |
Total assets measured at fair value | $ | 2,283 |  | $ | 80,305 |  | $ | — |  | $ | 82,588 |
* | The insurance contract invests approximately 19 percent in common stock of large-cap U.S. companies, 22 percent in U.S. Government securities, 10 percent in mortgage-backed securities, 36 percent in corporate bonds and 13 percent in other investments.
| Fair Value Measurements at December 31, 2014, 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, 2014 |
| (In thousands)
Assets: |  |  |  |
Cash equivalents | $ | — |  | $ | 2,097 |  | $ | — |  | $ | 2,097 |
Equity securities: |  |  |  |  |
U.S. companies | 2,614 |  | — |  | — |  | 2,614 |
International companies | 25 |  | — |  | — |  | 25 |
Insurance contract* | — |  | 82,846 |  | — |  | 82,846 |
Total assets measured at fair value | $ | 2,639 |  | $ | 84,943 |  | $ | — |  | $ | 87,582 |
* | The insurance contract invests approximately 54 percent in common stock of large-cap U.S. companies, 11 percent in U.S. Government securities, 10 percent in mortgage-backed securities, 10 percent in corporate bonds and 15 percent in other investments.
Benefit payments expected to be paid | The following benefit payments, which reflect future service, as appropriate, and expected Medicare Part D subsidies are as follows:
Years | Pension Benefits |  | Other Postretirement Benefits |  | Expected Medicare Part D Subsidy |
|  | (In thousands) |  |
2016 | $ | 24,223 |  | $ | 5,234 |  | $ | 197 |
2017 | 24,680 |  | 5,351 |  | 191 |
2018 | 24,980 |  | 5,420 |  | 183 |
2019 | 25,323 |  | 5,441 |  | 175 |
2020 | 25,700 |  | 5,331 |  | 168 |
2021 - 2025 | 133,029 |  | 27,261 |  | 688 |
Multiemployer plans |
| 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 | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2013 |
|  |  |  |  | (In thousands) |  |
Edison Pension Plan | 93-6061681-001 | Green as of 12/31/2015 | Green as of 12/31/2014 | No | $ | 5,517 |  | $ | 9,061 |  | $ | 6,358 |  | No | 12/31/2017
IBEW Local No. 82 Pension Plan | 31-6127268-001 | Red as of 6/30/2015 | Red as of 6/30/2014 | Implemented | 2,252 |  | 1,392 |  | 1,284 |  | No | 11/29/2015*
IBEW Local No. 246 Pension Plan | 34-6582842-001 | Yellow as of 5/31/2015 | Yellow as of 5/31/2014 | Implemented | 433 |  | 694 |  | 1,848 |  | No | 10/31/2017
IBEW Local No. 357 Pension Plan A | 88-6023284-001 | Green | Green | No | 1,896 |  | 3,575 |  | 2,348 |  | No | 5/31/2018
IBEW Local 648 Pension Plan | 31-6134845-001 | Red as of 2/28/2015 | Red as of 2/28/2014 | Implemented | 745 |  | 1,110 |  | 1,489 |  | No | 9/2/2018
Idaho Plumbers and Pipefitters Pension Plan | 82-6010346-001 | Green as of 5/31/2015 | Green as of 5/31/2014 | No | 1,169 |  | 1,125 |  | 1,121 |  | No | 9/30/2016
Local Union 212 IBEW Pension Trust Fund | 31-6127280-001 | Yellow as of 4/30/2015 | Yellow as of 4/30/2014 | Implemented | 937 |  | 568 |  | 531 |  | No | 6/5/2016
National Automatic Sprinkler Industry Pension Fund | 52-6054620-001 | Red as of 12/31/2015 | Red as of 12/31/2014 | Implemented | 677 |  | 608 |  | 583 |  | No | 3/31/2016- 7/31/2018
National Electrical Benefit Fund | 53-0181657-001 | Green | Green | No | 5,271 |  | 6,476 |  | 5,883 |  | No | 6/30/2015*- 11/30/2019
Pension Trust Fund for Operating Engineers | 94-6090764-001 | Red as of 12/31/2015 | Red as of 12/31/2014 | Implemented | 1,997 |  | 1,445 |  | 1,510 |  | No | 6/15/2015*– 6/30/2016
Operating Engineers Local 800 & WY Contractors Association, Inc. Pension Plan for Wyoming** | 83-6011320-001 | Red as of 12/31/2015 | Red as of 12/31/2014 | Implemented | — |  | 68 |  | 76 |  | No | 10/31/2005*
Sheet Metal Workers' Pension Plan of Southern CA, AZ and NV | 95-6052257-001 | Red as of 12/31/2015 | Red as of 12/31/2014 | Implemented | 714 |  | 676 |  | 512 |  | No | 6/30/2016
Southwest Marine Pension Trust | 95-6123404-001 | Red | Red | Implemented | 26 |  | 31 |  | 42 |  | No | 1/31/2014*– 1/31/2019
Other funds |  |  |  |  | 17,478 |  | 15,988 |  | 15,675 |  |  |
Total contributions | $ | 39,112 |  | $ | 42,817 |  | $ | 39,260 |  |  |
* | Plan includes collective bargaining agreements which have expired. The agreements contain provisions that automatically renew the existing contracts in lieu of a new negotiated collective bargaining agreement.
** | The Company withdrew from the plan as of October 26, 2014, as discussed below.
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 | 2014 and 2013
IBEW Local No. 82 Pension Plan | 2014 and 2013
Local Union No. 124 IBEW Pension Trust Fund | 2014 and 2013
Local Union 212 IBEW Pension Trust Fund | 2014 and 2013
IBEW Local Union No. 357 Pension Plan A | 2014 and 2013
IBEW Local 573 Pension Plan | 2014
IBEW Local 648 Pension Plan | 2014 and 2013
Idaho Plumbers and Pipefitters Pension Plan | 2014
Minnesota Teamsters Construction Division Pension Fund | 2014 and 2013
Operating Engineers Local 800 & WY Contractors Association, Inc. Pension Plan for Wyoming* | 2014 and 2013
Pension and Retirement Plan of Plumbers and Pipefitters Union Local No. 525 | 2014 and 2013
* | The Company withdrew from the plan as of October 26, 2014, as discussed below.

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947 + Details
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