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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014 and 2013, and amounts recognized in the Consolidated Balance Sheets at December 31, 2014 and 2013, were as follows:

	Pension Benefits						Other Postretirement Benefits
	2014			2013			2014			2013
	(In thousands)
Change in benefit obligation:
Benefit obligation at beginning of year	$	402,772		$	459,111		$	81,726		$	103,358
Service cost	129			155			1,518			1,675
Interest cost	17,682			16,249			3,521			3,215
Plan participants' contributions	—			—			1,399			1,472
Actuarial (gain) loss	80,520			(44,551		)	18,024			(20,985		)
Benefits paid	(25,766		)	(28,192		)	(7,176		)	(7,009		)
Benefit obligation at end of year	475,337			402,772			99,012			81,726
Change in net plan assets:
Fair value of plan assets at beginning of year	334,844			309,184			84,543			74,361
Actual gain on plan assets	24,500			35,539			7,527			13,819
Employer contribution	20,785			18,313			1,293			1,900
Plan participants' contributions	—			—			1,399			1,472
Benefits paid	(25,766		)	(28,192		)	(7,176		)	(7,009		)
Fair value of net plan assets at end of year	354,363			334,844			87,586			84,543
Funded status - (under) over	$	(120,974	)	$	(67,928	)	$	(11,426	)	$	2,817
Amounts recognized in the Consolidated Balance Sheets at December 31:
Other assets (noncurrent)	$	—		$	—		$	4,345		$	9,679
Other accrued liabilities (current)	—			—			(322		)	(381		)
Other liabilities (noncurrent)	(120,974		)	(67,928		)	(15,449		)	(6,481		)
Net amount recognized	$	(120,974	)	$	(67,928	)	$	(11,426	)	$	2,817
Amounts recognized in accumulated other comprehensive (income) loss consist of:
Actuarial loss	$	207,430		$	135,061		$	25,779		$	11,314
Prior service cost (credit)	294			365			(15,744		)	(17,137		)
Total	$	207,724		$	135,426		$	10,035		$	(5,823	)

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:

	2014			2013
	(In thousands)
Projected benefit obligation	$	475,337		$	402,772
Accumulated benefit obligation	$	475,337		$	402,772
Fair value of plan assets	$	354,363		$	334,844

Components of net periodic benefit cost

Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans for the years ended December 31 were as follows:

	Pension Benefits									Other Postretirement Benefits
	2014			2013			2012			2014			2013			2012
	(In thousands)
Components of net periodic benefit cost (credit):
Service cost	$	129		$	155		$	1,078		$	1,518		$	1,675		$	1,747
Interest cost	17,682			16,249			17,598			3,521			3,215			4,166
Expected return on assets	(21,218		)	(19,917		)	(23,536		)	(4,617		)	(4,343		)	(4,890		)
Amortization of prior service cost (credit)	71			71			(46		)	(1,393		)	(1,457		)	(1,438		)
Recognized net actuarial loss	4,869			7,173			7,070			649			1,814			2,134
Curtailment gain	—			—			(1,023		)	—			—			—
Amortization of net transition obligation	—			—			—			—			—			2,128
Net periodic benefit cost (credit), including amount capitalized	1,533			3,731			1,141			(322		)	904			3,847
Less amount capitalized	388			727			937			(21		)	164			910
Net periodic benefit cost (credit)	1,145			3,004			204			(301		)	740			2,937
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive (income) loss:
Net (gain) loss	77,238			(60,173		)	19,982			15,114			(30,461		)	1,863
Prior service credit	—			—			—			—			—			(11,418		)
Amortization of actuarial loss	(4,869		)	(7,173		)	(7,070		)	(649		)	(1,814		)	(2,134		)
Amortization of prior service (cost) credit	(71		)	(71		)	1,069			1,393			1,457			1,438
Amortization of net transition obligation	—			—			—			—			—			(2,128		)
Total recognized in accumulated other comprehensive (income) loss	72,298			(67,417		)	13,981			15,858			(30,818		)	(12,379		)
Total recognized in net periodic benefit cost (credit) and accumulated other comprehensive (income) loss	$	73,443		$	(64,413	)	$	14,185		$	15,557		$	(30,078	)	$	(9,442	)

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
	2014		2013		2014		2013
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	%

Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31 were as follows:

	Pension Benefits				Other Postretirement Benefits
	2014		2013		2014		2013
Discount rate	4.53	%	3.65	%	4.48	%	3.67	%
Expected return on plan assets	7.00	%	7.00	%	6.00	%	6.00	%
Rate of compensation increase	N/A		N/A		3.00	%	4.00	%

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:

				2014					2013
Health care trend rate assumed for next year	4.0	%	–	7.0	%	6.0	%	–	7.0	%
Health care cost trend rate - ultimate	5.0	%	–	6.0	%	5.0	%	–	6.0	%
Year in which ultimate trend rate achieved				2017					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, 2014:

	1 Percentage  Point Increase			1 Percentage Point Decrease
	(In thousands)
Effect on total of service and interest cost components	$	247		$	(207	)
Effect on postretirement benefit obligation	$	4,489		$	(3,832	)

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, 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.

	Fair Value Measurements  at December 31, 2013, 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, 2013
	(In thousands)
Assets:
Cash equivalents	$	—		$	9,406		$	—		$	9,406
Equity securities:
U.S. companies	62,599			—			—			62,599
International companies	39,437			—			—			39,437
Collective and mutual funds*	116,265			42,483			—			158,748
Corporate bonds	—			42,721			—			42,721
Municipal bonds	—			7,561			—			7,561
U.S. Government securities	7,487			4,335			—			11,822
Total assets measured at fair value	$	225,788		$	106,506		$	—		$	332,294

* Collective and mutual funds invest approximately 11 percent in common stock of mid-cap U.S. companies, 19 percent in common stock of large-cap U.S. companies, 12 percent in U.S. Government securities, 27 percent in corporate bonds, 13 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, 2014 and 2013, 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, 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.

	Fair Value Measurements  at December 31, 2013, 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, 2013
	(In thousands)
Assets:
Cash equivalents	$	—		$	2,142		$	—		$	2,142
Equity securities:
U.S. companies	2,802			—			—			2,802
International companies	221			—			—			221
Insurance contract*	—			79,374			—			79,374
Total assets measured at fair value	$	3,023		$	81,516		$	—		$	84,539

* The insurance contract invests approximately 55 percent in common stock of large-cap U.S. companies, 12 percent in U.S. Government securities, 8 percent in mortgage-backed securities, 8 percent in common stock of mid-cap U.S. companies, 9 percent in corporate bonds and 8 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)
2015	$	23,769		$	5,162		$	218
2016	24,025			5,186			213
2017	24,621			5,262			207
2018	25,064			5,329			200
2019	25,498			5,344			193
2020 - 2024	133,935			26,714			836

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		2014		2013			2014			2013			2012
							(In thousands)
Edison Pension Plan	93-6061681-001	Green as of 12/31/2014		Green as of 12/31/2013		No	$	9,061		$	6,358		$	5,171		No	12/31/2014*
IBEW Local 38 Pension Plan	34-6574238-001	Yellow as of 4/30/2014		Yellow as of 4/30/2013		Implemented	777			1,041			2,771			No	4/23/2017
IBEW Local No. 82 Pension Plan	31-6127268-001	Red as of 6/30/2014		Red as of 6/30/2013		Implemented	1,392			1,284			1,093			No	11/29/2015
IBEW Local No. 246 Pension Plan	34-6582842-001	Yellow as of 5/31/2014		Yellow as of 5/31/2013		Implemented	694			1,848			1			No	10/31/2017
IBEW Local 648 Pension Plan	31-6134845-001	Red as of 2/28/2014		Red as of 2/28/2013		Implemented	1,110			1,489			564			No	8/31/2015
Laborers Pension Trust Fund for Northern California	94-6277608-001	Yellow as of 5/31/2014		Yellow as of 5/31/2013		Implemented	663			921			567			No	6/30/2016
National Electrical Benefit Fund	53-0181657-001	Green		Green		No	6,476			5,883			5,603			No	11/30/2019
OE Pension Trust Fund	94-6090764-001	Red as of 12/31/2014		Yellow		Implemented	1,445			1,510			1,156			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 12/31/2014		Red as of 12/31/2013		Implemented	68			76			91			No	10/31/2005*
Operating Engineers Pension Trust	95-6032478-001	Red as of 6/30/2014		Red as of 6/30/2013		Implemented	612			493			761			No	7/1/2016
Sheet Metal Workers' Pension Plan of Southern CA, AZ and NV	95-6052257-001	Red as of 12/31/2014		Red as of 12/31/2013		Implemented	676			512			467			No	6/30/2015
Southwest Marine Pension Trust	95-6123404-001	Red as of 12/31/2014		Red as of 12/31/2013		Implemented	31			42			76			No	1/31/2014*– 1/31/2019
Other funds							19,812			17,803			16,458
Total contributions							$	42,817		$	39,260		$	34,779

* 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	2013 and 2012
IBEW Local 38 Pension Plan	2012
IBEW Local No. 82 Pension Plan	2013 and 2012
Local Union No. 124 IBEW Pension Trust Fund	2013 and 2012
Local Union 212 IBEW Pension Trust Fund	2013 and 2012
IBEW Local Union No. 357 Pension Plan A	2013 and 2012
IBEW Local 648 Pension Plan	2013 and 2012
Idaho Plumbers and Pipefitters Pension Plan	2012
Minnesota Teamsters Construction Division Pension Fund	2013 and 2012
Operating Engineers Local 800 & WY Contractors Association, Inc. Pension Plan for Wyoming*	2013 and 2012
Pension and Retirement Plan of Plumbers and Pipefitters Union Local No. 525	2013 and 2012

* The Company withdrew from the plan as of October 26, 2014, as discussed below.

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Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation.

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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.

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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.

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