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Retirement Plans (Tables) | 12 Months Ended
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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 | )

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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