Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plan Disclosure [Line Items]

Asset Allocation

As of December 31, 2018 and 2017, these assets were allocated among asset categories as follows:

Asset Category	2018			2017			Current Minimum, Target and Maximum Allocation Policy
U.S. equity securities		52	%		51	%		30% — 50%— 70	%
International equity securities		17	%		21	%		0% — 20%— 30	%
Debt securities		28	%		28	%		15% — 30%— 55	%
Cash and cash equivalents		3	%		—	%		0% — 0%— 5	%
		100	%		100	%

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 Welfare Plan
	Pension Plan						SERP
	2018			2017			2018			2017			2018			2017
Change in benefit obligation
Benefit obligation at beginning of year	$	354,994		$	337,176		$	1,412		$	1,457		$	679		$	675
Service cost		7,622			10,677			—			—			—			—
Interest cost		15,499			13,729			49			58			24			27
Actuarial loss (gain)		(44,935	)		34,563			(70	)		42			143			52
Gross benefits paid		(11,749	)		(7,718	)		(145	)		(145	)		(103	)		(75	)
Curtailments		(3,081	)		(33,433	)		—			—			—			—
Acquisition		63,133			—			—			—			—			—
Benefit obligation at end of year	$	381,483		$	354,994		$	1,246		$	1,412		$	743		$	679
Accumulated benefit obligation at end of year	$	356,797		$	324,904		$	1,246		$	1,412		$	743		$	679

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 (a)		4.4	%		3.7	%	4.4	%	3.7	%	4.4	%	3.7	%
Rate of compensation increase	Service-based table			Service-based table			—		—		—		—
Health care cost trend rate
Initial rate		—			—		—		—		7.0	%	7.0	%
Ultimate rate		—			—		—		—		5.0	%	5.0	%
Years to ultimate		—			—		—		—		2025		2022

 (a) The discount rate for the Higman pension plan in 2018 was changed from 4.13% as of February 14, 2018 and 4.02% as of March 31, 2018 to 4.40% as of December 31, 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	$	—	$	—	$	—	$	—	$	75		$	75
Decrease		—		—		—		—		(65	)		(65	)

Change in Plan Assets

Change in plan assets
Fair value of plan assets at beginning of year	$	294,995		$	257,517		$	—		$	—		$	—		$	—
Actual return on plan assets		(18,214	)		45,196			—			—			—			—
Employer contribution		8,102			—			145			145			103			75
Gross benefits paid		(11,749	)		(7,718	)		(145	)		(145	)		(103	)		(75	)
Acquisition		30,017			—			—			—			—			—
Fair value of plan assets at end of year	$	303,151		$	294,995		$	—		$	—		$	—		$	—

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, 2018 and 2017 (in thousands):

													Other Postretirement Benefits
	Pension Benefits												Postretirement Welfare Plan
	Pension Plan						SERP
	2018			2017			2018			2017			2018			2017
Funded status at end of year
Fair value of plan assets	$	303,151		$	294,995		$	—		$	—		$	—		$	—
Benefit obligations		(381,483	)		(354,994	)		(1,246	)		(1,412	)		(743	)		(679	)
Funded status and amount recognized at end of year	$	(78,332	)	$	(59,999	)	$	(1,246	)	$	(1,412	)	$	(743	)	$	(679	)

Amounts Recognized in the Consolidated Balance Sheets

Amounts recognized in the consolidated balance sheets
Noncurrent asset	$	—		$	—		$	—		$	—		$	—		$	—
Current liability		—			—			(158	)		(159	)		(65	)		(54	)
Long-term liability		(78,332	)		(59,999	)		(1,087	)		(1,253	)		(678	)		(625	)

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income
Net actuarial loss (gain)	$	47,101	$	57,387	$	415	$	508	$	(4,313	)	$	(5,053	)
Prior service cost (credit)		—		—		—		—		—			—
Accumulated other compensation income	$	47,101	$	57,387	$	415	$	508	$	(4,313	)	$	(5,053	)

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, 2018 and 2017 were as follows (in thousands):

	Pension Benefits
	Pension Plan				SERP
	2018		2017		2018		2017
Projected benefit obligation in excess of plan assets
Projected benefit obligation at end of year	$	381,483	$	354,994	$	1,246	$	1,412
Fair value of plan assets at end of year		303,151		294,995		—		—

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, 2018 and 2017 were as follows (in thousands):

	Pension Benefits
	Pension Plan				SERP
	2018		2017		2018		2017
Accumulated benefit obligation in excess of plan assets
Projected benefit obligation at end of year	$	381,483	$	354,994	$	1,246	$	1,412
Accumulated benefit obligation at end of year		356,797		324,904		1,246		1,412
Fair value of plan assets at end of year		303,151		294,995		—		—

Employer Contribution

The following tables presents the expected cash flows for the Company’s defined benefit plans and postretirement benefit plan at December 31, 2018 and 2017 (in thousands):

									Other Postretirement Benefits
	Pension Benefits								Postretirement Welfare Plan
	Pension Plan				SERP
	2018		2017		2018		2017		2018		2017
Expected employer contributions
First year	$	2,395	$	—	$	162	$	162	$	66	$	48

Expected Benefit Payments

									Other Postretirement Benefits
	Pension Benefits								Postretirement Welfare Plan
	Pension Plan				SERP
	2018		2017		2018		2017		2018		2017
Expected benefit payments (gross)
Year one	$	12,209	$	9,483	$	162	$	162	$	66	$	55
Year two		13,108		10,131		159		159		68		56
Year three		13,959		10,818		155		156		69		58
Year four		14,959		11,608		130		152		57		58
Year five		16,052		12,377		104		149		56		46
Next five years		96,547		75,717		447		462		261		214

Expected Federal Subsidy

									Other Postretirement Benefits
	Pension Benefits								Postretirement Welfare Plan
	Pension Plan				SERP
	2018		2017		2018		2017		2018		2017
Expected federal subsidy
Year one	$	—	$	—	$	—	$	—	$	—	$	(7	)
Year two		—		—		—		—		—		(6	)
Year three		—		—		—		—		—		(6	)
Year four		—		—		—		—		—		(6	)
Year five		—		—		—		—		—		(7	)
Next five years		—		—		—		—		—		(30	)

Pension Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

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, 2018, 2017 and 2016 were as follows (in thousands):

	Pension Benefits
	Pension Plan									SERP
	2018			2017			2016			2018			2017			2016
Components of net periodic benefit cost
Service cost	$	7,622		$	10,677		$	13,402		$	—		$	—		$	—
Interest cost		15,499			13,729			14,123			49			58			65
Expected return on plan assets		(22,406	)		(18,195	)		(16,805	)		—			—			—
Amortization:
Actuarial loss		2,890			4,400			5,484			23			28			26
Prior service credit		—			—			—			—			—			—
Net periodic benefit cost		3,605			10,611			16,204			72			86			91
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Current year actuarial loss (gain)		(7,396	)		7,562			15,203			(70	)		42			12
Recognition of actuarial loss		(2,890	)		(37,833	)		(5,484	)		(23	)		(28	)		(26	)
Recognition of prior service credit		—			—			—			—			—			—
Total recognized in other comprehensive income		(10,286	)		(30,271	)		9,719			(93	)		14			(14	)
Total recognized in net periodic benefit cost and other comprehensive income	$	(6,681	)	$	(19,660	)	$	25,923		$	(21	)	$	100		$	77
Weighted average assumptions used to determine net periodic benefit cost
Discount rate (a)		3.7	%		4.2/4.0	%		4.5	%		3.7	%		4.2	%		4.5	%
Expected long-term rate of return on plan assets		7.0	%		7.0	%		7.0	%		—			—			—
Rate of compensation increase	Service- based table			Service- based table			Service- based table				—			—			—

(a) The 2018 discount rate for benefit cost for the Higman pension plan was changed from 4.13% as of February 14, 2018 and 4.02% as of March 31, 2018 to 4.40% as of December 31, 2018.  In 2017, benefit cost for the pension plan was determined using a discount rate of 4.2% for the period beginning January 1, 2017 and ending April 11, 2017 and 4.0% for the period beginning April 12, 2017 and ending December 31, 2017.

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 2019 are as follows (in thousands):

	Pension Benefits
	Pension Plan		SERP
Actuarial loss	$	2,713	$	28
Prior service credit		—		—
	$	2,713	$	28

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

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, 2018, 2017 and 2016 were as follows (in thousands):

	Other Postretirement Benefits
	Postretirement Welfare Plan
	2018			2017			2016
Components of net periodic benefit cost
Service cost	$	—		$	—		$	—
Interest cost		24			27			29
Amortization:
Actuarial gain		(596	)		(668	)		(747	)
Prior service cost		—			—			—
Net periodic benefit cost		(572	)		(641	)		(718	)
Other changes in benefit obligations recognized in other comprehensive income
Current year actuarial loss (gain)		144			52			(198	)
Recognition of actuarial gain		596			668			747
Recognition of prior service cost		—			—			—
Adjustment for actual Medicare Part D reimbursement		—			—			(3	)
Total recognized in other comprehensive income		740			720			546
Total recognized in net periodic benefit cost and other comprehensive income	$	168		$	79		$	(172	)
Weighted average assumptions used to determine net periodic benefit cost
Discount rate		3.7	%		4.2	%		4.5	%
Health care cost trend rate:
Initial rate		7.0	%		7.0	%		6.5	%
Ultimate rate		5.0	%		5.0	%		5.0	%
Years to ultimate		2022			2021			2019
Effect of one-percentage-point change in assumed health care cost trend rate on aggregate service and interest cost
Increase	$	3		$	3		$	4
Decrease		(2	)		(3	)		(3	)

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 2019 are as follows (in thousands):

	Other Postretirement Benefits
	Postretirement Welfare Plan
Actuarial gain	$	(540	)
Prior service cost		—
	$	(540	)