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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Summary of Asset Allocation

As of December 31, 2015 and 2014, these assets were allocated among asset categories as follows:

Asset Category		2015				2014				Current Minimum, Target and Maximum Allocation Policy
U.S. equity securities			50	%			52	%			30% — 50%— 70	%
International equity securities			18	%			18	%			0% — 20%— 30	%
Debt securities			28	%			30	%			15% — 30%— 55	%
Cash and cash equivalents			4	%			—	%			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
		2015				2014				2015				2014				2015				2014
Change in benefit obligation
Benefit obligation at beginning of year		$	315,075			$	249,960			$	1,637			$	1,529			$	1,264			$	2,307
Service cost			14,683				10,645				—				—				—				—
Interest cost			13,302				12,839				64				73				36				110
Actuarial loss (gain)			(39,474	)			66,640				(30	)			180				(321	)			(1,065	)
Gross benefits paid			(6,261	)			(25,009	)			(145	)			(145	)			(88	)			(88	)
Benefit obligation at end of year		$	297,325			$	315,075			$	1,526			$	1,637			$	891			$	1,264
Accumulated benefit obligation at end of year		$	238,775			$	241,592			$	1,526			$	1,637			$	—			$	—

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			4.5	%			4.1	%			4.5	%			4.1	%			4.5	%			4.1	%
Rate of compensation increase		Age-based table					4.25	%			—				—				—				—
Health care cost trend rate
Initial rate			—				—				—				—				6.5	%			7.0	%
Ultimate rate			—				—				—				—				5.0	%			5.0	%
Years to ultimate			—				—				—				—				2019				2019

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		$	—			$	—			$	—			$	—			$	107			$	167
Decrease			—				—				—				—				(93	)			(141	)

Summary of Change in Plan Assets

Change in plan assets
Fair value of plan assets at beginning of year		$	242,275			$	254,523			$	—			$	—			$	—			$	—
Actual return on plan assets			(2,426	)			12,761				—				—				—				—
Employer contribution			10,000				—				145				145				88				88
Gross benefits paid			(6,261	)			(25,009	)			(145	)			(145	)			(88	)			(88	)
Fair value of plan assets at end of year		$	243,588			$	242,275			$	—			$	—			$	—			$	—

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, 2015 and 2014 (in thousands):

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2015				2014				2015				2014				2015				2014
Funded status at end of year
Fair value of plan assets		$	243,588			$	242,275			$	—			$	—			$	—			$	—
Benefit obligations			297,325				315,075				1,526				1,637				891				1,264
Funded status and amount recognized at end of year		$	(53,737	)		$	(72,800	)		$	(1,526	)		$	(1,637	)		$	(891	)		$	(1,264	)

Amounts Recognized in the Consolidated Balance Sheets

Amounts recognized in the consolidated balance sheets
Noncurrent asset		$	—			$	—			$	—			$	—			$	—			$	—
Current liability			—				—				(149	)			(141	)			(68	)			(83	)
Long-term liability			(53,737	)			(72,800	)			(1,377	)			(1,496	)			(823	)			(1,181	)

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income
Net actuarial loss (gain)		$	77,940			$	104,795			$	508			$	566			$	(6,319	)		$	(6,787	)
Prior service cost (credit)			—				—				—				—				—				—
Accumulated other compensation income		$	77,940			$	104,795			$	508			$	566			$	(6,319	)		$	(6,787	)

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, 2015 and 2014 were as follows (in thousands):

	Pension Benefits
	Pension Plan								SERP
	2015				2014				2015				2014
Projected benefit obligation in excess of plan assets
Projected benefit obligation at end of year		$	297,325			$	315,075			$	1,526			$	1,637
Fair value of plan assets at end of year			243,588				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, 2015 and 2014 were as follows (in thousands):

	Pension Benefits
	Pension Plan								SERP
	2015				2014				2015				2014
Accumulated benefit obligation in excess of plan assets
Projected benefit obligation at end of year		$	—			$	—			$	1,526			$	1,637
Accumulated benefit obligation at end of year			—				—				1,526				1,637
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, 2015 and 2014 (in thousands):

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2015				2014				2015				2014				2015				2014
Expected employer contributions
First year		$	—			$	8,400			$	152			$	143			$	70			$	84

Expected Benefit Payments

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2015				2014				2015				2014				2015				2014
Expected benefit payments (gross)
Year one		$	7,678			$	7,100			$	152			$	143			$	81			$	96
Year two			8,298				7,672				157				151				86				98
Year three			9,013				8,333				154				155				86				103
Year four			9,748				9,080				152				153				86				95
Year five			10,415				9,868				149				150				85				94
Next five years			63,860				62,666				608				621				341				445

Summary of Expected Federal Subsidy

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2015				2014				2015				2014				2015				2014
Expected federal subsidy
Year one		$	—			$	—			$	—			$	—			$	(11	)		$	(11	)
Year two			—				—				—				—				(11	)			(11	)
Year three			—				—				—				—				(11	)			(11	)
Year four			—				—				—				—				(12	)			(12	)
Year five			—				—				—				—				(12	)			(12	)
Next five years			—				—				—				—				(55	)			(55	)

Pension Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost and other changes in plan assets and benefit obligations recognized in other comprehensive income for the Company’s defined benefit plans for the years ended December 31, 2015, 2014 and 2013 were as follows (in thousands):

		Pension Benefits
		Pension Plan												SERP
		2015				2014				2013				2015				2014				2013
Components of net periodic benefit cost
Service cost		$	14,683			$	10,645			$	12,824			$	—			$	—			$	—
Interest cost			13,302				12,839				11,400				64				73				70
Expected return on plan assets			(17,921	)			(18,858	)			(16,127	)			—				—				—
Amortization:
Actuarial loss			7,728				701				8,276				28				16				19
Prior service credit			—				—				—				—				—				—
Net periodic benefit cost			17,792				5,327				16,373				92				89				89
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Current year actuarial loss (gain)			(19,127	)			72,737				(61,759	)			(30	)			180				(138	)
Recognition of actuarial loss			(7,728	)			(701	)			(8,276	)			(28	)			(16	)			(19	)
Recognition of prior service credit			—				—				—				—				—				—
Total recognized in other comprehensive income			(26,855	)			72,036				(70,035	)			(58	)			164				(157	)
Total recognized in net periodic benefit cost and other comprehensive income		$	(9,063	)		$	77,363			$	(53,662	)		$	34			$	253			$	(68	)

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			4.1	%			5.0	%			4.1	%			4.1	%			5.0	%			4.1	%
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	%			—				—				—

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 2016 are as follows (in thousands):

		Pension Benefits
		Pension Plan				SERP
Actuarial loss		$	4,924			$	26
Prior service credit			—				—
		$	4,924			$	26

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost and other changes in benefit obligations recognized in other comprehensive income for the Company’s postretirement benefit plan for the years ended December 31, 2015, 2014 and 2013 were as follows (in thousands):

		Other Postretirement Benefits
		Postretirement Welfare Plan
		2015				2014				2013
Components of net periodic benefit cost
Service cost		$	—			$	—			$	—
Interest cost			36				110				112
Amortization:
Actuarial gain			(793	)			(649	)			(620	)
Prior service cost			—				—				—
Net periodic benefit cost			(757	)			(539	)			(508	)
Other changes in benefit obligations recognized in other comprehensive income
Current year actuarial gain			(322	)			(1,065	)			(600	)
Recognition of actuarial gain			793				649				620
Recognition of prior service cost			—				—				—
Adjustment for actual Medicare Part D reimbursement			(3	)			(8	)			(5	)
Total recognized in other comprehensive income			468				(424	)			15
Total recognized in net periodic benefit cost and other comprehensive income		$	(289	)		$	(963	)		$	(493	)

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			4.1	%			5.0	%			4.1	%
Health care cost trend rate:
Initial rate			7.0	%			7.0	%			7.5	%
Ultimate rate			5.0	%			5.0	%			5.0	%
Years to ultimate			2019				2018				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 aggregate service and interest cost
Increase		$	5			$	7			$	10
Decrease			(4	)			(6	)			(9	)

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 2016 are as follows (in thousands):

		Other Postretirement Benefits
		Postretirement Welfare Plan
Actuarial gain		$	(745	)
Prior service cost			—
		$	(745	)

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