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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2016

Defined Benefit Plan Disclosure [Line Items]

Summary of Asset Allocation

As of December 31, 2016 and 2015, these assets were allocated among asset categories as follows:

Asset Category		2016				2015				Current Minimum, Target and Maximum Allocation Policy
U.S. equity securities			51	%			50	%			30% — 50%— 70	%
International equity securities			19	%			18	%			0% — 20%— 30	%
Debt securities			30	%			28	%			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
		2016				2015				2016				2015				2016				2015
Change in benefit obligation
Benefit obligation at beginning of year		$	297,325			$	315,075			$	1,526			$	1,637			$	891			$	1,264
Service cost			13,402				14,683				—				—				—				—
Interest cost			14,123				13,302				65				64				29				36
Actuarial loss (gain)			19,120				(39,474	)			12				(30	)			(198	)			(321	)
Gross benefits paid			(6,794	)			(6,261	)			(146	)			(145	)			(47	)			(88	)
Benefit obligation at end of year		$	337,176			$	297,325			$	1,457			$	1,526			$	675			$	891
Accumulated benefit obligation at end of year		$	272,591			$	238,775			$	1,457			$	1,526			$	675			$	891

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			4.2	%			4.5	%			4.2	%			4.5	%			4.2	%			4.5	%
Rate of compensation increase		Service- based table				Service- based table					—				—				—				—
Health care cost trend rate
Initial rate			—				—				—				—				7.0	%			6.5	%
Ultimate rate			—				—				—				—				5.0	%			5.0	%
Years to ultimate			—				—				—				—				2021				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		$	—			$	—			$	—			$	—			$	74			$	107
Decrease			—				—				—				—				(64	)			(93	)

Summary of Change in Plan Assets

Change in plan assets
Fair value of plan assets at beginning of year		$	243,588			$	242,275			$	—			$	—			$	—			$	—
Actual return on plan assets			20,723				(2,426	)			—				—				—				—
Employer contribution			—				10,000				146				145				47				88
Gross benefits paid			(6,794	)			(6,261	)			(146	)			(145	)			(47	)			(88	)
Fair value of plan assets at end of year		$	257,517			$	243,588			$	—			$	—			$	—			$	—

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, 2016 and 2015 (in thousands):

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2016				2015				2016				2015				2016				2015
Funded status at end of year
Fair value of plan assets		$	257,517			$	243,588			$	—			$	—			$	—			$	—
Benefit obligations			(337,176	)			(297,325	)			(1,457	)			(1,526	)			(675	)			(891	)
Funded status and amount recognized at end of year		$	(79,659	)		$	(53,737	)		$	(1,457	)		$	(1,526	)		$	(675	)		$	(891	)

Amounts Recognized in the Consolidated Balance Sheets

Amounts recognized in the consolidated balance sheets
Noncurrent asset		$	—			$	—			$	—			$	—			$	—			$	—
Current liability			—				—				(150	)			(149	)			(56	)			(68	)
Long-term liability			(79,659	)			(53,737	)			(1,307	)			(1,377	)			(619	)			(823	)

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income
Net actuarial loss (gain)		$	87,658			$	77,940			$	494			$	508			$	(5,773	)		$	(6,319	)
Prior service cost (credit)			—				—				—				—				—				—
Accumulated other compensation income		$	87,658			$	77,940			$	494			$	508			$	(5,773	)		$	(6,319	)

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, 2016 and 2015 were as follows (in thousands):

		Pension Benefits
		Pension Plan								SERP
		2016				2015				2016				2015
Projected benefit obligation in excess of plan assets
Projected benefit obligation at end of year		$	337,176			$	297,325			$	1,457			$	1,526
Fair value of plan assets at end of year			257,517				243,588				—				—

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, 2016 and 2015 were as follows (in thousands):

		Pension Benefits
		Pension Plan								SERP
		2016				2015				2016				2015
Accumulated benefit obligation in excess of plan assets
Projected benefit obligation at end of year		$	337,176			$	—			$	1,457			$	1,526
Accumulated benefit obligation at end of year			272,591				—				1,457				1,526
Fair value of plan assets at end of year			257,517				—				—				—

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, 2016 and 2015 (in thousands):

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2016				2015				2016				2015				2016				2015
Expected employer contributions
First year		$	—			$	—			$	153			$	152			$	50			$	70

Expected Benefit Payments

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2016				2015				2016				2015				2016				2015
Expected benefit payments (gross)
Year one		$	8,032			$	7,678			$	153			$	152			$	58			$	81
Year two			8,835				8,298				157				157				58				86
Year three			9,646				9,013				155				154				58				86
Year four			10,400				9,748				151				152				58				86
Year five			11,201				10,415				148				149				57				85
Next five years			70,419				63,860				514				608				199				341

Summary of Expected Federal Subsidy

																		Other Postretirement Benefits
		Pension Benefits																Postretirement
		Pension Plan								SERP								Welfare Plan
		2016				2015				2016				2015				2016				2015
Expected federal subsidy
Year one		$	—			$	—			$	—			$	—			$	(7	)		$	(11	)
Year two			—				—				—				—				(7	)			(11	)
Year three			—				—				—				—				(7	)			(11	)
Year four			—				—				—				—				(7	)			(12	)
Year five			—				—				—				—				(7	)			(12	)
Next five years			—				—				—				—				(33	)			(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, 2016, 2015 and 2014 were as follows (in thousands):

		Pension Benefits
		Pension Plan												SERP
		2016				2015				2014				2016				2015				2014
Components of net periodic benefit cost
Service cost		$	13,402			$	14,683			$	10,645			$	—			$	—			$	—
Interest cost			14,123				13,302				12,839				65				64				73
Expected return on plan assets			(16,805	)			(17,921	)			(18,858	)			—				—				—
Amortization:
Actuarial loss			5,484				7,728				701				26				28				16
Prior service credit			—				—				—				—				—				—
Net periodic benefit cost			16,204				17,792				5,327				91				92				89
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Current year actuarial loss (gain)			15,203				(19,127	)			72,737				12				(30	)			180
Recognition of actuarial loss			(5,484	)			(7,728	)			(701	)			(26	)			(28	)			(16	)
Recognition of prior service credit			—				—				—				—				—				—
Total recognized in other comprehensive income			9,719				(26,855	)			72,036				(14	)			(58	)			164
Total recognized in net periodic benefit cost and other comprehensive income		$	25,923			$	(9,063	)		$	77,363			$	77			$	34			$	253

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			4.5	%			4.1	%			5.0	%			4.5	%			4.1	%			5.0	%
Expected long-term rate of return on plan assets			7.0	%			7.5	%			7.5	%			—				—				—
Rate of compensation increase		Service- based table					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 2017 are as follows (in thousands):

		Pension Benefits
		Pension Plan				SERP
Actuarial loss		$	5,477			$	28
Prior service credit			—				—
		$	5,477			$	28

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, 2016, 2015 and 2014 were as follows (in thousands):

		Other Postretirement Benefits
		Postretirement Welfare Plan
		2016				2015				2014
Components of net periodic benefit cost
Service cost		$	—			$	—			$	—
Interest cost			29				36				110
Amortization:
Actuarial gain			(747	)			(793	)			(649	)
Prior service cost			—				—				—
Net periodic benefit cost			(718	)			(757	)			(539	)
Other changes in benefit obligations recognized in other comprehensive income
Current year actuarial gain			(198	)			(322	)			(1,065	)
Recognition of actuarial gain			747				793				649
Recognition of prior service cost			—				—				—
Adjustment for actual Medicare Part D reimbursement			(3	)			(3	)			(8	)
Total recognized in other comprehensive income			546				468				(424	)
Total recognized in net periodic benefit cost and other comprehensive income		$	(172	)		$	(289	)		$	(963	)

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			4.5	%			4.1	%			5.0	%
Health care cost trend rate:
Initial rate			6.5	%			7.0	%			7.0	%
Ultimate rate			5.0	%			5.0	%			5.0	%
Years to ultimate			2019				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 aggregate service and interest cost
Increase		$	4			$	5			$	7
Decrease			(3	)			(4	)			(6	)

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 2017 are as follows (in thousands):

		Other Postretirement Benefits
		Postretirement Welfare Plan
Actuarial gain		$	(668	)
Prior service cost			—
		$	(668	)

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