Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

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)	2012			2011			2012			2011
	Pension						Postretirement Benefits
Accumulated benefit obligation	$	269,101		$	211,896
Benefit obligation:
Balance at beginning of period	$	250,619		$	233,772		$	88,064		$	83,748
Service cost	10,527			9,173			1,853			1,769
Interest cost	10,801			10,960			4,248			4,443
Actuarial (gain) loss	65,048			17,024			(5,413		)	1,858
Plan amendments	—			(169		)	—			—
Termination benefit charge	—			414			—			—
Retiree drug subsidy program	—			—			360			302
Benefits paid	(13,455		)	(20,555		)	(3,327		)	(4,056		)
Balance at end of period	$	323,540		$	250,619		$	85,785		$	88,064
Plan assets:
Fair value of plan assets at beginning of period	$	195,659		$	212,454		$	78,121		$	80,118
Actual return (loss) on plan assets	24,841			1,485			8,778			(1,653		)
Employer contributions	2,379			2,275			3,617			3,712
Benefits paid	(13,455		)	(20,555		)	(3,327		)	(4,056		)
Fair value of plan assets at end of period	$	209,424		$	195,659		$	87,189		$	78,121
Funded status of plan	$	(114,116	)	$	(54,960	)	$	1,404		$	(9,943	)
Noncurrent assets	$	—		$	—		$	1,404		$	—
Current liabilities	(3,834		)	(2,371		)	—			—
Noncurrent liabilities	(110,282		)	(52,589		)	—			(9,943		)
Net asset (liability) recognized	$	(114,116	)	$	(54,960	)	$	1,404		$	(9,943	)
Amounts recognized to accumulated other comprehensive income:
Prior service costs, net of taxes	$	528		$	749		$	—		$	—
Net actuarial (gain) loss, net of taxes	52,472			36,976			(715		)	451
Transition obligation, net of taxes	—			—			222			408
Total accumulated other comprehensive income (loss)	$	53,000		$	37,725		$	(493	)	$	859

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		2012		2011		Target		2012		2011
Asset category:
Equity securities	41	%	41	%	39	%	60	%	60	%	60	%
Debt securities	38	%	38	%	40	%	40	%	40	%	40	%
Other	21	%	21	%	21	%	—	%	—	%	—	%
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)	2012			2011			2010
Pension Plans
Components of net periodic benefit cost:
Service cost	$	10,527		$	9,173		$	8,574
Interest cost	10,801			10,960			11,365
Expected long-term return on assets	(14,093		)	(15,471		)	(12,915		)
Prior service cost amortization	517			496			496
Actuarial loss amortization	8,603			6,435			5,773
Termination benefit charge	—			414			—
Net periodic expense	$	16,355		$	12,007		$	13,293
Postretirement Benefit Plans
Components of net periodic benefit cost:
Service cost	$	1,853		$	1,769		$	2,064
Interest cost	4,248			4,443			4,833
Expected long-term return on assets	(4,438		)	(4,418		)	(3,986		)
Actuarial loss amortization	37			—			—
Transition obligation amortization	1,917			1,917			1,917
Net periodic expense	$	3,617		$	3,711		$	4,828

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)	2012			2011			2010
Pension Plans
Net actuarial loss experienced during the year	$	28,748		$	14,312		$	4,332
Net actuarial loss recognized as expense	(4,908		)	(3,755		)	(3,290		)
Prior service cost recognized as expense	(340		)	(298		)	(298		)
Total recognized in other comprehensive income	23,500			10,259			744
Postretirement Benefit Plans
Net actuarial (gain) loss experienced during the year	$	(1,787	)	$	2,111		$	(2,094	)
Transition obligation recognized as expense	(294		)	(286		)	(280		)
Total recognized in other comprehensive income (loss)	$	(2,081	)	$	1,825		$	(2,374	)

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 2013 are as follows:

(in thousands)
Amortization of prior service cost	$	313
Amortization of net actuarial loss	$	8,591

Estimated amounts to be amortized from accumulated other comprehensive income into benefit cost during 2013 are as follows:

(in thousands)
Amortization of transition obligation	$	264

Schedule of weighted average rate assumptions

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

Years ended December 31,	2012		2011		2010
Pension Plans
Discount rate	4.52	%	4.89	%	5.49	%
Expected long-term return on plan assets	7.00	%	7.25	%	7.25	%
Rate of compensation increase for pay-related plans	3.59	%	3.75	%	3.95	%
Postretirement Benefit Plans
Discount rate	4.95	%	5.45	%	5.90	%
Expected long-term return on plan assets	7.00	%	7.25	%	7.25	%
Rate of compensation increase	3.55	%	3.61	%	3.69	%

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

Years ended December 31,	2012		2011
Pension Plans
Discount rate	3.47	%	4.52	%
Rate of compensation increase for pay-related plans	3.71	%	3.59	%
Postretirement Benefit Plans
Discount rate	4.15	%	4.95	%
Rate of compensation increase for pay-related plans	3.70	%	3.55	%

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,	2012		2011
Health care cost trend rate assumed for next year	6.75	%	7.00	%
Rate to which the cost trend rate is assumed to decline	5.00	%	5.00	%
Year that rate reaches ultimate rate	2020		2020

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	$	(381	)	$	456
Effect on net postretirement benefit obligation	$	(3,688	)	$	4,342

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
2013	$20,354	$4,435	$(243)
2014	$20,982	$4,586	$(248)
2015	$21,679	$4,754	$(252)
2016	$23,155	$4,940	$(258)
2017	$28,139	$5,165	$(260)
2018-2022	$166,646	$28,565	$(1,333)

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, 2012
(in thousands)	Level 1		Level 2		Level 3		Total
United States equities	$	41,907	$	9,072	$	—	$	50,979
Global equities	23,782		10,697		—		34,479
Fixed income	—		78,806		—		78,806
Alternative investments	—		27,659		14,500		42,159
Cash and cash equivalents	—		3,001		—		3,001
Total	$	65,689	$	129,235	$	14,500	$	209,424
	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

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)	2012			2011
Balance at beginning of period	$	17,399		$	26,841
Unrealized gains (losses)	992			(752		)
Unrealized gains relating to instruments held at the reporting date	242			635
Settlements	(4,948		)	(9,604		)
Purchases	815			279
Balance at end of period	$	14,500		$	17,399

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, 2012
(in thousands)	Level 1		Level 2		Total
United States equities	$	37,482	$	—	$	37,482
Global equities	15,049		—		15,049
Fixed income	—		34,658		34,658
Total	$	52,531	$	34,658	$	87,189

	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

Nonqualified Supplemental Retirement Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of allocation of plan assets

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

	December 31, 2012
(in thousands)	Level 1		Level 2		Level 3		Total
Insurance contracts	$	—	$	7,399	$	5,600	$	12,999
United States equities	4,741		—		—		4,741
Global equities	2,109		—		—		2,109
Fixed income	—		10,219		—		10,219
Total	$	6,850	$	17,618	$	5,600	$	30,068

	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

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)	2012		2011
Balance at beginning of period	$	5,332	$	5,069
Unrealized gains relating to instruments held at the reporting date	268		263
Balance at end of period	$	5,600	$	5,332