Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

Summary of Asset Allocation

As of December 31, 2014 and 2013, these assets were allocated among asset categories as follows:

Asset Category	2014			2013			Current Minimum, Target and Maximum Allocation Policy
U.S. equity securities		52	%		51	%		30% — 50%— 70	%
International equity securities		18	%		21	%		0% — 20%— 30	%
Debt securities		30	%		28	%		15% — 30%— 55	%
Cash and cash equivalents		—	%		—	%		0% — 0%— 5	%
		100	%		100	%

Schedule of Change in Benefit Obligation

The following table presents the change in benefit obligation and plan assets for the Company’s defined benefit plans and postretirement benefit plan (in thousands):

													Other Postretirement Benefits
	Pension Benefits												Postretirement
	Pension Plan						SERP						Welfare Plan
	2014			2013			2014			2013			2014			2013
Change in benefit obligation
Benefit obligation at beginning of year	$	249,960		$	266,911		$	1,529		$	1,746		$	2,307		$	2,854
Service cost		10,645			12,824			—			—			—			—
Interest cost		12,839			11,400			73			70			110			112
Actuarial loss (gain)		66,640			(35,767	)		180			(138	)		(1,065	)		(600	)
Gross benefits paid		(25,009	)		(5,408	)		(145	)		(149	)		(88	)		(59	)
Benefit obligation at end of year	$	315,075		$	249,960		$	1,637		$	1,529		$	1,264		$	2,307
Accumulated benefit obligation at end of year	$	241,592		$	200,577		$	1,637		$	1,529		$	—		$	—

Weighted-Average Assumption Used to Determine Benefit Obligation and Net Periodic Benefit Cost

Weighted-average assumption used to determine benefit obligation at end of year
Discount rate	4.1	%	5.0	%	4.1	%	5.0	%	4.1	%	5.0	%
Rate of compensation increase	4.25	%	4.25	%	—		—		—		—
Health care cost trend rate
Initial rate	—		—		—		—		7.0	%	7.0	%
Ultimate rate	—		—		—		—		5.0	%	5.0	%
Years to ultimate	—		—		—		—		2019		2018

Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate

Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation
Increase	$	—	$	—	$	—	$	—	$	167		$	202
Decrease		—		—		—		—		(141	)		(178	)

Summary of Change in Plan Assets

Change in plan assets
Fair value of plan assets at beginning of year	$	254,523		$	217,811		$	—		$	—		$	—		$	—
Actual return on plan assets		12,761			42,120			—			—			—			—
Employer contribution		—			—			145			149			88			59
Gross benefits paid		(25,009	)		(5,408	)		(145	)		(149	)		(88	)		(59	)
Fair value of plan assets at end of year	$	242,275		$	254,523		$	—		$	—		$	—		$	—

Summary of Funded Status at End of Year

The following table presents the funded status and amounts recognized in the Company’s consolidated balance sheet for the Company’s defined benefit plans and postretirement benefit plan at December 31, 2014 and 2013 (in thousands):

												Other Postretirement Benefits
	Pension Benefits											Postretirement
	Pension Plan					SERP						Welfare Plan
	2014			2013		2014			2013			2014			2013
Funded status at end of year
Fair value of plan assets	$	242,275		$	254,523	$	—		$	—		$	—		$	—
Benefit obligations		315,075			249,960		1,637			1,529			1,264			2,307
Funded status and amount recognized at end of year recognized at end of year	$	(72,800	)	$	4,563	$	(1,637	)	$	(1,529	)	$	(1,264	)	$	(2,307	)

Amounts Recognized in The Consolidated Balance Sheets

Amounts recognized in the consolidated balance sheets
Noncurrent asset	$	—		$	4,563	$	—		$	—		$	—		$	—
Current liability		—			—		(141	)		(140	)		(83	)		(197	)
Long-term liability		(72,800	)		—		(1,496	)		(1,389	)		(1,181	)		(2,110	)

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income
Net actuarial loss (gain)	$	104,795	$	32,760	$	566	$	402	$	(6,787	)	$	(6,364	)
Prior service cost (credit)		—		—		—		—		—			—
Accumulated other compensation income	$	104,795	$	32,760	$	566	$	402	$	(6,787	)	$	(6,364	)

Projected Benefit Obligation in Excess Of Plan Assets

The projected benefit obligation and fair value of plan assets for pension plans with a projected benefit obligation in excess of plan assets at December 31, 2014 and 2013 were as follows (in thousands):

	Pension Benefits
	Pension Plan				SERP
	2014		2013		2014		2013
Projected benefit obligation in excess of plan assets
Projected benefit obligation at end of year	$	315,075	$	—	$	1,637	$	1,529
Fair value of plan assets at end of year		242,275		—		—		—

Accumulated Benefit Obligation in Excess Of Plan Assets

The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2014 and 2013 were as follows (in thousands):

	Pension Benefits
	Pension Plan						SERP
	2014			2013			2014			2013
Accumulated benefit obligation in excess of plan assets
Projected benefit obligation at end of year		$	—		$	—		$	1,637		$	1,529
Accumulated benefit obligation at end of year			—			—			1,637			1,529
Fair value of plan assets at end of year			—			—			—			—

Schedule of Employer Contribution

The following tables presents the expected cash flows for the Company’s defined benefit plans and postretirement benefit plan at December 31, 2014 and 2013 (in thousands):

									Other Postretirement Benefits
	Pension Benefits								Postretirement
	Pension Plan				SERP				Welfare Plan
	2014		2013		2014		2013		2014		2013
Expected employer contributions
First year	$	8,400	$	—	$	143	$	144	$	84	$	202

Expected Benefit Payments

									Other Postretirement Benefits
	Pension Benefits								Postretirement
	Pension Plan				SERP				Welfare Plan
	2014		2013		2014		2013		2014		2013
Expected benefit payments (gross)
Year one	$	7,100	$	6,538	$	143	$	144	$	96	$	215
Year two		7,672		6,996		151		142		98		218
Year three		8,333		7,598		155		149		103		219
Year four		9,080		8,321		153		154		95		229
Year five		9,868		9,140		150		151		94		226
Next five years		62,666		59,242		621		663		445		976

Summary of Expected Federal Subsidy

													Other Postretirement Benefits
	Pension Benefits												Postretirement
	Pension Plan						SERP						Welfare Plan
	2014			2013			2014			2013			2014				2013
Expected federal subsidy
Year one		$	—		$	—		$	—		$	—		$	(11	)		$	(13	)
Year two			—			—			—			—			(11	)			(13	)
Year three			—			—			—			—			(11	)			(13	)
Year four			—			—			—			—			(12	)			(12	)
Year five			—			—			—			—			(12	)			(12	)
Next five years			—			—			—			—			(55	)			(55	)

Pension Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Weighted-Average Assumption Used to Determine Benefit Obligation and Net Periodic Benefit Cost

Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.0	%	4.1	%	4.6	%	5.0	%	4.1	%	4.6	%
Expected long-term rate of return on plan assets	7.5	%	7.5	%	7.5	%	—		—		—
Rate of compensation increase	4.25	%	4.25	%	4.25	%	—		—		—

Components of Net Periodic Benefit Cost

	Pension Benefits
	Pension Plan									SERP
	2014			2013			2012			2014			2013			2012
Components of net periodic benefit cost
Service cost	$	10,645		$	12,824		$	10,206		$	—		$	—		$	—
Interest cost		12,839			11,400			10,506			73			70			73
Expected return on plan assets		(18,858	)		(16,127	)		(12,872	)		—			—			—
Amortization:
Actuarial loss		701			8,276			7,395			16			19			14
Prior service credit		—			—			—			—			—			—
Net periodic benefit cost		5,327			16,373			15,235			89			89			87
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Current year actuarial loss (gain)		72,737			(61,759	)		23,557			180			(138	)		131
Recognition of actuarial loss		(701	)		(8,276	)		(7,395	)		(16	)		(19	)		(14	)
Recognition of prior service credit		—			—			—			—			—			—
Total recognized in other comprehensive income		72,036			(70,035	)		16,162			164			(157	)		117
Total recognized in net periodic benefit cost and other comprehensive income	$	77,363		$	(53,662	)	$	31,397		$	253		$	(68	)	$	204

Estimated Amounts that will be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost

The estimated amounts that will be amortized from accumulated other comprehensive income into net periodic benefit cost in 2015 are as follows (in thousands):

	Pension Benefits
	Pension Plan		SERP
Actuarial loss	$	7,845	$	28
Prior service credit		—		—
	$	7,845	$	28

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Weighted-Average Assumption Used to Determine Benefit Obligation and Net Periodic Benefit Cost

Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.0	%	4.1	%	4.6	%
Health care cost trend rate:
Initial rate	7.0	%	7.5	%	7.5	%
Ultimate rate	5.0	%	5.0	%	5.0	%
Years to ultimate	2018		2018		2017

Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate

Effect of one-percentage-point change in assumed health care cost trend rate on aggregate service and interest cost
Increase	$	7		$	10		$	13
Decrease		(6	)		(9	)		(11	)

Components of Net Periodic Benefit Cost

	Other Postretirement Benefits
	Postretirement Welfare Plan
	2014			2013			2012
Components of net periodic benefit cost
Service cost	$	—		$	—		$	—
Interest cost		110			112			133
Amortization:
Actuarial gain		(649	)		(620	)		(618	)
Prior service cost		—			—			—
Net periodic benefit cost		(539	)		(508	)		(485	)
Other changes in benefit obligations recognized in other comprehensive income
Current year actuarial gain		(1,065	)		(600	)		(235	)
Recognition of actuarial gain		649			620			618
Recognition of prior service cost		—			—			—
Adjustment for actual Medicare Part D reimbursement		(8	)		(5	)		(10	)
Total recognized in other comprehensive income		(424	)		15			373
Total recognized in net periodic benefit cost and other comprehensive income	$	(963	)	$	(493	)	$	(112	)

Estimated Amounts that will be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost

The estimated amounts that will be amortized from accumulated other comprehensive income into net periodic benefit cost in 2015 are as follows (in thousands):

	Other Postretirement Benefits
	Postretirement Welfare Plan
Actuarial gain	$	(690	)
Prior service cost		—
	$	(690	)