Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Compensation and Retirement Disclosure [Abstract]

Changes in benefit obligation and plan assets

Changes in benefit obligation and plan assets for the years ended December 31, 2011 and 2010, and amounts recognized in the Consolidated Balance Sheets at December 31, 2011 and 2010, were as follows:

	Pension Benefits						Other Postretirement Benefits
	2011			2010			2011			2010
	(In thousands)
Change in benefit obligation:
Benefit obligation at beginning of year	$	388,589		$	352,915		$	91,286		$	88,151
Service cost	2,252			2,889			1,443			1,357
Interest cost	19,500			19,761			4,700			4,817
Plan participants' contributions	—			—			2,644			2,500
Amendments	—			353			—			121
Actuarial loss	62,722			34,687			17,940			3,228
Curtailment gain	(13,939		)	—			—			—
Benefits paid	(23,506		)	(22,016		)	(7,324		)	(8,888		)
Benefit obligation at end of year	435,618			388,589			110,689			91,286
Change in net plan assets:
Fair value of plan assets at beginning of year	277,598			255,327			70,610			66,984
Actual gain (loss) on plan assets	(4,718		)	37,853			(872		)	7,278
Employer contribution	28,626			6,434			3,027			2,736
Plan participants' contributions	—			—			2,644			2,500
Benefits paid	(23,506		)	(22,016		)	(7,324		)	(8,888		)
Fair value of net plan assets at end of year	278,000			277,598			68,085			70,610
Funded status - under	$	(157,618	)	$	(110,991	)	$	(42,604	)	$	(20,676	)
Amounts recognized in the Consolidated Balance Sheets at December 31:
Other accrued liabilities (current)	$	—		$	—		$	(550	)	$	(525	)
Other liabilities (noncurrent)	(157,618		)	(110,991		)	(42,054		)	(20,151		)
Net amount recognized	$	(157,618	)	$	(110,991	)	$	(42,604	)	$	(20,676	)
Amounts recognized in accumulated other comprehensive (income) loss consist of:
Actuarial loss	$	189,494		$	117,840		$	43,861		$	20,751
Prior service cost (credit)	(632		)	631			(8,615		)	(11,292		)
Transition obligation	—			—			2,128			4,253
Total	$	188,862		$	118,471		$	37,374		$	13,712

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 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 at December 31 were as follows:

	2011		2010
	(In thousands)
Projected benefit obligation	$	435,618	$	388,589
Accumulated benefit obligation	$	435,618	$	374,538
Fair value of plan assets	$	278,000	$	277,598

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
	2011			2010			2009			2011			2010			2009
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	2,252		$	2,889		$	8,127		$	1,443		$	1,357		$	2,206
Interest cost	19,500			19,761			21,919			4,700			4,817			5,465
Expected return on assets	(22,809		)	(23,643		)	(25,062		)	(5,051		)	(5,512		)	(5,471		)
Amortization of prior service cost (credit)	45			152			605			(2,677		)	(3,303		)	(2,756		)
Recognized net actuarial loss	4,656			2,622			2,096			753			845			970
Curtailment loss	1,218			—			1,650			—			—			—
Amortization of net transition obligation	—			—			—			2,125			2,125			2,125
Net periodic benefit cost, including amount capitalized	4,862			1,781			9,335			1,293			329			2,539
Less amount capitalized	1,196			791			1,127			(50		)	(92		)	330
Net periodic benefit cost	3,666			990			8,208			1,343			421			2,209
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive (income) loss:
Net (gain) loss	76,310			20,477			(29,000		)	23,863			1,462			(2,314		)
Prior service cost (credit)	—			353			—			—			121			(9,321		)
Amortization of actuarial loss	(4,656		)	(2,622		)	(2,096		)	(753		)	(845		)	(970		)
Amortization of prior service (cost) credit	(1,263		)	(152		)	(2,255		)	2,677			3,303			2,756
Amortization of net transition obligation	—			—			—			(2,125		)	(2,125		)	(2,125		)
Total recognized in accumulated other comprehensive (income) loss	70,391			18,056			(33,351		)	23,662			1,916			(11,974		)
Total recognized in net periodic benefit cost and accumulated other comprehensive (income) loss	$	74,057		$	19,046		$	(25,143	)	$	25,005		$	2,337		$	(9,765	)

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
	2011		2010		2011		2010
Discount rate	4.16	%	5.26	%	4.13	%	5.21	%
Expected return on plan assets	7.75	%	7.75	%	6.75	%	6.75	%
Rate of compensation increase	N/A		4.00	%	4.00	%	4.00	%

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

	Pension Benefits					Other Postretirement Benefits
	2011			2010		2011		2010
Discount rate	5.26	%		5.75	%	5.21	%	5.75	%
Expected return on plan assets	7.75	%		8.25	%	6.75	%	7.25	%
Rate of compensation increase	4.00	% / N/A	*	4.00	%	4.00	%	4.00	%

* Effective June 30, 2011, all benefit and service accruals for a union plan were frozen. Compensation increases had previously been frozen for all other plans.

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:

				2011					2010
Health care trend rate assumed for next year	6.0	%	-	8.0	%	6.0	%	-	8.5	%
Health care cost trend rate - ultimate	5.0	%	-	6.0	%	5.0	%	-	6.0	%
Year in which ultimate trend rate achieved	1999		-	2017		1999		-	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, 2011:

	1 Percentage  Point Increase		1 Percentage Point  Decrease
	(In thousands)
Effect on total of service and interest cost components	$	171	$	(822	)
Effect on postretirement benefit obligation	$	3,175	$	(10,946	)

The fair value of the Company's pension net plan assets by class

The fair value of the Company's pension net plan assets by class is as follows:

	Fair Value Measurements at December 31, 2011, 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, 2011
	(In thousands)
Assets:
Cash equivalents	$	2,256	$	17,534	$	—	$	19,790
Equity securities:
U.S. companies	99,315		—		—		99,315
International companies	35,353		—		—		35,353
Collective and mutual funds (a)	43,214		15,541		—		58,755
Corporate bonds	—		23,579		289		23,868
Mortgage-backed securities	—		22,987		—		22,987
Municipal bonds	—		9,290		—		9,290
U.S. Treasury securities	—		8,642		—		8,642
Total assets measured at fair value	$	180,138	$	97,573	$	289	$	278,000

(a) Collective and mutual funds invest approximately 26 percent in common stock of mid-cap U.S. companies, 26 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Treasuries, 6 percent in corporate bonds and 29 percent in other investments.

	Fair Value Measurements at December 31, 2010, 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, 2010
	(In thousands)
Assets:
Cash equivalents	$	4,663	$	8,699	$	—	$	13,362
Equity securities:
U.S. companies	102,944		—		—		102,944
International companies	40,017		—		—		40,017
Collective and mutual funds (a)	45,410		17,701		—		63,111
Collateral held on loaned securities (b)	—		23,148		694		23,842
Corporate bonds	—		23,014		—		23,014
Mortgage-backed securities	—		19,478		—		19,478
U.S. Treasury securities	—		9,239		—		9,239
Municipal bonds	—		8,285		—		8,285
Total assets measured at fair value	193,034		109,564		694		303,292
Liabilities:
Obligation for collateral received	25,694		—		—		25,694
Net assets measured at fair value	$	167,340	$	109,564	$	694	$	277,598

(a) Collective and mutual funds invest approximately 28 percent in common stock of mid-cap U.S. companies, 24 percent in common stock of large-cap U.S. companies, 13 percent in U.S. Treasuries, 11 percent in mortgage-backed securities, 10 percent in corporate bonds, 8 percent in foreign fixed-income investments and 6 percent in common stock of small-cap U.S. companies.

(b) This class includes collateral held at December 31, 2010, as a result of participation in a securities lending program. Cash collateral is invested by the trustee primarily in repurchase agreements, mutual funds and commercial paper.

Summary of changes in the fair value of the pension plan's Level 3 assets

The following table sets forth a summary of changes in the fair value of the pension plan's Level 3 assets for the year ended December 31, 2011:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Corporate Bonds			Collateral Held on Loaned Securities			Total
	(In thousands)
Balance at beginning of year	$	—		$	694		$	694
Total realized/unrealized losses	(2		)	(259		)	(261		)
Purchases, issuances and settlements (net)	291			(435		)	(144		)
Balance at end of year	$	289		$	—		$	289

The following table sets forth a summary of changes in the fair value of the pension plan's Level 3 assets for the year ended December 31, 2010:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Collateral Held on Loaned Securities
		(In thousands)
Balance at beginning of year		$	937
Total realized/unrealized losses		189
Purchases, issuances and settlements (net)		(432		)
Balance at end of year		$	694

Fair value of other postretirement benefit plan assets by asset class

The fair value of the Company's other postretirement benefit plan assets by asset class is as follows:

	Fair Value Measurements at December 31, 2011, 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, 2011
	(In thousands)
Assets:
Cash equivalents	$	59	$	1,836	$	—	$	1,895
Equity securities:
U.S. companies	2,098		—		—		2,098
International companies	262		—		—		262
Insurance investment contract*	—		63,830		—		63,830
Total assets measured at fair value	$	2,419	$	65,666	$	—	$	68,085

* The insurance investment contract invests approximately 49 percent in common stock of large-cap U.S. companies, 15 percent in U.S. Treasuries, 12 percent in mortgage-backed securities, 11 percent in corporate bonds, and 13 percent in other investments.

	Fair Value Measurements at December 31, 2010, 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, 2010
	(In thousands)
Assets:
Cash equivalents	$	53	$	1,274	$	—	$	1,327
Equity securities:
U.S. companies	2,791		—		—		2,791
International companies	353		—		—		353
Insurance investment contract*	—		66,139		—		66,139
Total assets measured at fair value	$	3,197	$	67,413	$	—	$	70,610

* The insurance investment contract invests approximately 53 percent in common stock of large-cap U.S. companies, 21 percent in corporate bonds, 12 percent in mortgage-backed securities and 14 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)
2012	$	22,426	$	6,892	$	618
2013	22,811		7,062		656
2014	23,082		7,188		694
2015	23,508		7,298		730
2016	23,893		7,371		766
2017 - 2021	127,895		37,682		4,322

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		2011	2010		2011		2010		2009
					(In thousands)
Edison Pension Plan	93-6061681-001	Green	Green	No	$	2,700	$	1,933	$	1,627	No	12/31/2012
IBEW Local 38 Pension Plan	34-6574238-001	Yellow as of 4/30/2011	Yellow as of 4/30/2010	Implemented	1,469		1,277		594		No	*
IBEW Local No. 82 Pension Plan	31-6127268-001	Red as of 6/30/2011	Red as of 6/30/2010	Implemented	1,331		1,569		1,197		No	*
IBEW Local 648 Pension Plan	31-6134845-001	Red as of 2/28/2011	Red as of 2/28/2010	Implemented	722		781		641		No	8/31/2012
Laborers Pension Trust Fund for Northern California	94-6277608-001	Yellow as of 5/31/2011	Yellow as of 5/31/2010	Implemented	628		413		325		No	6/30/2012*
Local Union 212 IBEW Pension Trust Fund	31-6127280-001	Yellow as of 4/30/2011	Yellow as of 4/30/2010	Implemented	776		679		469		No	*
National Electrical Benefit Fund	53-0181657-001	Green	Green	No	4,841		4,826		5,462		No	5/31/2014*
OE Pension Trust Fund	94-6090764-001	Yellow	Yellow	Implemented	1,367		1,035		1,061		No	3/31/2016*
Other funds					15,324		17,763		21,103
Total contributions					$	29,158	$	30,276	$	32,479

* 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 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)
Defined Benefit Pension Plan of AGC-IUOE Local 701 Pension Trust Fund	2010 and 2009
Edison Pension Plan	2010 and 2009
Eighth District Electrical Pension Fund	2010 and 2009
IBEW Local 38 Pension Plan	2010 and 2009
IBEW Local No. 82 Pension Plan	2010 and 2009
IBEW Local Union No. 357 Pension Plan A	2010 and 2009
IBEW Local 648 Pension Plan	2010 and 2009
Idaho Plumbers and Pipefitters Pension Plan	2010 and 2009
Laborers AGC Pension Trust of Montana	2009
Local Union No. 124 IBEW Pension Trust Fund	2010 and 2009
Local Union 212 IBEW Pension Trust Fund	2010 and 2009
Minnesota Teamsters Constr Division Pension Fund	2010 and 2009
Operating Engineers Local 800 and Wyoming Contractors Association, Inc. Pension Plan for Wyoming	2010 and 2009
Plumbers & Pipefitters Local 162 Pension Fund	2010 and 2009
Southwest Marine Pension Trust	2009