Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Plan Disclosure [Line Items]

Schedule of benefit obligations

Benefit Obligations: The following table sets forth the combined funded status of the defined qualified and nonqualified supplemental benefit plans along with the postretirement health care and life insurance benefit plans and their reconciliation with the related amounts in the Company’s consolidated financial statements:

As of December 31, (in thousands)	2011			2010			2011			2010
	Pension						Postretirement Benefits
Accumulated benefit obligation	$	211,896		$	196,421
Projected benefit obligation:
Balance at beginning of period	$	233,772		$	213,920		$	83,748		$	84,085
Service cost	9,173			8,574			1,769			2,064
Interest cost	10,960			11,365			4,443			4,833
Actuarial (gain) loss	17,024			12,961			1,858			(3,062		)
Plan amendments	(169		)	—			—			—
Termination benefit charge	414			—			—			—
Retiree drug subsidy program	—			—			302			—
Benefits paid	(20,555		)	(13,048		)	(4,056		)	(4,172		)
Balance at end of period	$	250,619		$	233,772		$	88,064		$	83,748
Plan assets:
Fair value of plan assets at beginning of period	$	212,454		$	167,653		$	80,118		$	72,227
Actual return (loss) on plan assets	1,485			20,443			(1,653		)	7,580
Employer contributions	2,275			37,406			3,712			4,483
Benefits paid	(20,555		)	(13,048		)	(4,056		)	(4,172		)
Fair value of plan assets at end of period	$	195,659		$	212,454		$	78,121		$	80,118
Funded status of plan	$	(54,960	)	$	(21,318	)	$	(9,943	)	$	(3,630	)
Noncurrent assets	$	—		$	12,804		$	—		$	1,103
Current liabilities	(2,371		)	(2,304		)	—			—
Noncurrent liabilities	(52,589		)	(31,818		)	(9,943		)	(4,733		)
Net liability recognized	$	(54,960	)	$	(21,318	)	$	(9,943	)	$	(3,630	)
Amounts recognized to accumulated other comprehensive income:
Prior service costs, net of taxes	$	749		$	945		$	—		$	—
Net actuarial (gain) loss, net of taxes	36,976			30,112			451			(915		)
Transition obligation, net of taxes	—			—			408			580
Total accumulated other comprehensive income (loss)	$	37,725		$	31,057		$	859		$	(335	)

Schedule of allocation of plan assets

The Company’s weighted-average plan asset allocations by asset category were as follows:

	Pension						Postretirement Benefits
As of December 31,	Target		2011		2010		Target		2011		2010
Asset category:
Equity securities	41	%	39	%	43	%	60	%	60	%	60	%
Debt securities	38	%	40	%	33	%	40	%	40	%	40	%
Other	21	%	21	%	24	%	—	%	—	%	—	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

Schedule of net periodic benefit cost

The components of net periodic benefit cost were:

Years ended December 31, (in thousands)	2011			2010			2009
Pension Plans
Components of net periodic benefit cost:
Service cost	$	9,173		$	8,574		$	7,340
Interest cost	10,960			11,365			12,064
Expected long-term return on assets	(15,471		)	(12,915		)	(14,002		)
Prior service cost amortization	496			496			579
Actuarial loss	6,435			5,773			3,987
Termination benefit charge	414			—			145
Net periodic expense	$	12,007		$	13,293		$	10,113
Postretirement Benefit Plans
Components of net periodic benefit cost:
Service cost	$	1,769		$	2,064		$	1,813
Interest cost	4,443			4,833			4,849
Expected long-term return on assets	(4,418		)	(3,986		)	(3,542		)
Actuarial loss	—			—			228
Transition amortization	1,917			1,917			1,917
Net periodic expense	$	3,711		$	4,828		$	5,265

Schedule of other changes in plan assets and projected benefit obligations recognized in other comprehensive income

Other changes in plan assets and projected benefit obligations recognized in other comprehensive income were as follows:

Years ended December 31, (in thousands)	2011			2010			2009
Pension Plans
Net actuarial loss experienced during the year	$	14,312		$	4,332		$	5,683
Net actuarial loss recognized as expense	(3,755		)	(3,290		)	(2,559		)
Prior service cost recognized as expense	(298		)	(298		)	(298		)
Total recognized in other comprehensive income	10,259			744			2,826
Postretirement Benefit Plans
Net actuarial (gain) loss experienced during the year	$	2,111		$	(2,094	)	$	(1,363	)
Amortization of net actuarial loss	—			—			(46		)
Amortization of transition asset	(286		)	(280		)	(280		)
Total recognized in other comprehensive income (loss)	$	1,825		$	(2,374	)	$	(1,689	)

Schedule of estimated amount to be amortized from accumulated other comprehensive income

Estimated amounts to be amortized from accumulated other comprehensive income into pension cost during 2012 are as follows:

(in thousands)
Amortization of prior service cost	$	341
Amortization of net actuarial loss	$	4,721

Estimated amounts to be amortized from accumulated other comprehensive income into benefit cost during 2012 are as follows:

(in thousands)
Amortization of transition obligation	$	286
Amortization of net actuarial gain	$	—

Schedule of weighted average rate assumptions

The weighted average rate assumptions to determine net periodic benefit costs were as follows:

Years ended December 31,	2011		2010		2009
Pension Plans
Discount rate	4.89	%	5.49	%	6.50	%
Expected long-term return on plan assets	7.25	%	7.25	%	8.25	%
Rate of compensation increase for pay-related plans	3.75	%	3.95	%	3.90	%
Postretirement Benefit Plans
Discount rate	5.45	%	5.90	%	6.50	%
Expected long-term return on plan assets	7.25	%	7.25	%	8.25	%
Rate of compensation increase	3.61	%	3.69	%	3.55	%

The weighted average rate assumptions used to determine the projected benefit obligations at the measurement date were as follows:

Years ended December 31,	2011		2010
Pension Plans
Discount rate	4.52	%	4.89	%
Rate of compensation increase for pay-related plans	3.59	%	3.75	%
Postretirement Benefit Plans
Discount rate	4.95	%	5.45	%
Rate of compensation increase for pay-related plans	3.55	%	3.61	%

Schedule of assumed post-65 health care cost rend rates

The assumed post-65 health care cost trend rates used to determine the postretirement benefit obligation at the measurement date were as follows:

As of December 31,	2011		2010
Health care cost trend rate assumed for next year	7.00	%	8.50	%
Rate to which the cost trend rate is assumed to decline	5.00	%	5.50	%
Year that rate reaches ultimate rate	2020		2017

Schedule of effect of 1 percentage point change in assumed health care cost trend rates

Assumed health care cost trend rates used in determining the accumulated postretirement benefit obligation have an effect on the amounts reported. For example, revising the weighted average health care cost trend rate by 1 percentage point would have the following effects:

(in thousands)
	1-Percentage Point Decrease			1-Percentage Point Increase
Effect on total of service and interest cost	$	(414	)	$	504
Effect on net postretirement benefit obligation	$	(4,503	)	$	5,313

Schedule of expected benefit payments

The following benefit payments, which reflect expected future service, as appropriate, are anticipated to be paid as follows. In addition, the following benefits reflect the expected prescription drug subsidy related to the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (Act). The Act includes a prescription drug benefit under Medicare Part D as well as a federal subsidy which began in 2007:

(in thousands)	Pension Benefits	Postretirement Benefits	Postretirement Benefits – Prescription Drug Subsidy
2012	$23,191	$4,821	$(278)
2013	$16,450	$5,090	$(284)
2014	$17,937	$5,264	$(289)
2015	$19,153	$5,465	$(294)
2016	$20,525	$5,689	$(299)
2017-2021	$138,746	$32,332	$(1,535)

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of allocation of plan assets

Plan assets included in the funded status of the pension plans were as follows:

	December 31, 2011
(in thousands)	Level 1		Level 2		Level 3		Total
United States equities	$	37,009	$	8,916	$	—	$	45,925
Global equities	20,064		4,914		4,352		29,330
Fixed income	—		78,443		—		78,443
Alternative investments	—		26,070		13,047		39,117
Cash and cash equivalents	—		2,844		—		2,844
Total	$	57,073	$	121,187	$	17,399	$	195,659
	December 31, 2010
(in thousands)	Level 1		Level 2		Level 3		Total
United States equities	$	44,566	$	10,360	$	—	$	54,926
Global equities	24,785		5,560		5,087		35,432
Fixed income	—		69,878		—		69,878
Alternative investments	—		26,688		21,754		48,442
Cash and cash equivalents	—		3,776		—		3,776
Total	$	69,351	$	116,262	$	26,841	$	212,454

Schedule of reconciliation of plan assets in Level 3 of fair value hierarchy

The following is a reconciliation of plan assets in Level 3 of the fair value hierarchy:

Years ended December 31, (in thousands)	2011			2010
Balance at beginning of period	$	26,841		$	21,808
Unrealized losses	(752		)	—
Unrealized gains relating to instruments held at the reporting date	635			1,242
Settlements	(9,604		)	—
Purchases	279			3,791
Balance at end of period	$	17,399		$	26,841

Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of allocation of plan assets

Plan assets included in the funded status of the postretirement benefit plans were as follows:

	December 31, 2011
(in thousands)	Level 1		Level 2		Total
United States equities	$	33,649	$	—	$	33,649
Global equities	13,088		—		13,088
Fixed income	—		31,384		31,384
Total	$	46,737	$	31,384	$	78,121

	December 31, 2010
(in thousands)	Level 1		Level 2		Total
United States equities	$	34,387	$	—	$	34,387
Global equities	13,603		—		13,603
Fixed income	—		32,128		32,128
Total	$	47,990	$	32,128	$	80,118

Nonqualified Supplemental Retirement Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of allocation of plan assets

her investment assets designated for payment of the nonqualified supplemental retirement plans were as follows:

	December 31, 2011
(in thousands)	Level 1		Level 2		Level 3		Total
Insurance contracts	$	—	$	6,620	$	5,332	$	11,952
United States equities	4,546		—		—		4,546
Global equities	1,798		—		—		1,798
Fixed income	—		9,454		—		9,454
Total	$	6,344	$	16,074	$	5,332	$	27,750

	December 31, 2010
(in thousands)	Level 1		Level 2		Level 3		Total
Insurance contracts	$	—	$	6,700	$	5,069	$	11,769
United States equities	4,738		—		—		4,738
Global equities	1,955		—		—		1,955
Fixed income	—		9,372		—		9,372
Total	$	6,693	$	16,072	$	5,069	$	27,834

Schedule of reconciliation of plan assets in Level 3 of fair value hierarchy

The following is a reconciliation of insurance contracts in Level 3 of the fair value hierarchy:

Years ended December 31, (in thousands)	2011		2010
Balance at beginning of period	$	5,069	$	4,824
Unrealized gains relating to instruments held at the reporting date	263		245
Balance at end of period	$	5,332	$	5,069