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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Status of Stock Options Related to Stock Plans | A summary of the status of the stock options related to the Stock Plans is presented below:
| Options Outstanding |  | Exercise Price Per Share (Low - High) |  |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (In thousands, except per share data, term in years) |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 | 33 |  |  | $ | 1.81 | - | 1.81 |  |  | $ | 1.81 |  |  | 0.3 |  | $ | 392 |
Exercised | (33) |  |  | $ | 1.81 | - | 1.81 |  |  | $ | 1.81 |  |  |  |  |
Schedule Intrinsic Value of Options Exercised |
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
| (In thousands) |  |  |  |
Intrinsic value of stock options exercised | $ | 426 |  |  | $ | 3,564 |  |  | $ | 425 |
Status of Non-Vested Restricted Stock and Restricted Stock Unit Grants Related to Stock Plans | A summary of the status of the non-vested restricted stock award and restricted stock unit grants related to the Stock Plans is presented below:
| Non-Vested Restricted Stock Awards and Restricted Stock Units |  | Weighted Average Grant Date Fair Value per Share
| (In thousands, except per share data) |  |
Balance at December 31, 2018 | 2,161 |  |  | $ | 21.20 |
Granted | 968 |  |  | $ | 13.38 |
Forfeited | (295) |  |  | $ | 19.75 |
Vested | (487) |  |  | $ | 18.82 |
Balance at December 31, 2019 | 2,347 |  |  | $ | 19.34 |
Status of Supplemental Executive Retirement Plan | The following table sets forth the status of the SERP:
| Year Ended December 31, |  |
| 2019 |  | 2018
Change in projected benefit obligation: | (In thousands) |  |
Obligation at January 1 | $ | 13,326 |  |  | $ | 13,556 |
Service cost | 1,731 |  |  | 1,933 |
Interest cost | 575 |  |  | 470 |
Actuarial loss (gain) | 2,641 |  |  | (2,368) |
Amendments/settlements/curtailments loss (gain) | — |  |  | — |
Benefits paid | (265) |  |  | (265) |
Obligation at December 31 (1) | $ | 18,008 |  |  | $ | 13,326 |
Accumulated benefit obligation | $ | 13,694 |  |  | $ | 10,191 |
(1) For 2019, approximately $0.4 million is included in other accrued liabilities and approximately $17.6 million is included in other long-term liabilities in the accompanying consolidated balance sheets. For 2018, approximately $0.3 million is included in other accrued liabilities and approximately $13.0 million is included in other long-term liabilities in the accompanying consolidated balance sheets.
Schedule of Funded Status |
| Year Ended December 31, |  |
| 2019 |  | 2018
| (In thousands) |  |
Change in fair value of plan assets: |  |  |
Plan assets at January 1 | $ | — |  |  | $ | — |
Actual return on plan assets | — |  |  | — |
Employer contributions | 265 |  |  | 265 |
Benefits paid | (265) |  |  | (265) |
Plan assets at December 31 | — |  |  | — |
Funded status recognized | $ | (18,008) |  |  | $ | (13,326) |
Cost Components of Supplemental Executive Retirement Plan | The following table provides the cost components of the SERP:
| Year Ended December 31, |  |
| 2019 |  | 2018
| (In thousands) |  |
Service cost | $ | 1,731 |  |  | $ | 1,933 |
Interest cost | 575 |  |  | 470 |
Net pension expense (benefit) | $ | 2,306 |  |  | $ | 2,403 |
Weighted Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs | The weighted average assumptions used to determine the benefit obligation and net periodic benefit costs consist of:
| As of December 31, |  |
| 2019 |  | 2018
Discount rate | 2.99 | % |  | 4.36 | %
Rate of compensation increase | 3.00 | % |  | 3.00 | %
Estimated Future Benefit Payments | The estimated future benefit payments expected to be paid for each of the next five years and the sum of the payments expected for the next five years thereafter are:
| Estimated Future Benefit Payments
Year Ending December 31, | (In thousands)
2020 | $ | 360 |
2021 | $ | 360 |
2022 | $ | 360 |
2023 | $ | 360 |
2024 | $ | 360 |
2025 - 2029 | $ | 2,414 |
Schedule of Multiemployer Pension Plans Affecting Period-to-Period Comparability of Contributions | Our participation in the AI Pension Plan for 2019, 2018 and 2017 is outlined in the table below. The “EIN/Pension Plan Number” column provides the Employee Identification Number (the “EIN”). Unless otherwise noted, the most recent Pension Protection Act of 2006 (the “PPA”) zone status available in the years ended December 31, 2019 and 2018 is for the plan’s year-end at December 31, 2018 and 2017, respectively. The zone status is based on information that we received from the AI Pension Plan. Among other factors, plans in the red zone are generally less than 65% funded (“Critical Status”), plans in the yellow zone are less than 80% funded and plans in the green zone are at least 80% funded. The “FIP/RP Status - Pending/Implemented” column indicates plans for which a Financial Improvement Plan (“FIP”) or a Rehabilitation Plan (“RP”) is either pending or has been implemented. The last column lists the expiration dates of the collective bargaining agreements to which the plan is subject. The number of employees covered by the AI Pension Plan decreased 1.0% from December 31, 2017 to December 31, 2018 and decreased 5.5% from December 31, 2018 to December 31, 2019, affecting the period-to-period comparability of the contributions for 2019, 2018 and 2017.
|  |  |  | Pension Protection Act Zone Status |  |  |  | FIP/RP Status |  | Sonic Contributions |  |  |  |  |  | Surcharge Imposed |  | Collective Bargaining Agreement Expiration Date
Pension Fund |  | EIN/Pension Plan Number |  | 2019 |  | 2018 |  | Pending /Implemented |  | Year Ended December 31, |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | 2019 |  | 2018 |  | 2017 |  |  |  |
|  |  |  |  |  |  |  |  |  | (In thousands) |  |  |  |  |  |  |  |
AI Pension Plan |  | 94-1133245 |  | Red |  | Red |  | RP Implemented |  | $181 |  |  | $176 |  |  | $171 |  |  | Yes |  | Between October 2021 and February 2022

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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=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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