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EMPLOYEE BENEFIT PLAN | 3 Months Ended
--- | ---
Mar. 31, 2021
EMPLOYEE BENEFIT PLAN |
EMPLOYEE BENEFIT PLAN | 10. EMPLOYEE BENEFIT PLAN The following represents the net periodic benefit cost and related components of the Company’s multiple employer Retirement Income Plan: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ | ​ | March 31,
(in thousands) |  | 2021 |  | 2020
Interest cost |  | $ | 247 |  | $ | 411
Expected return on plan assets |  | ​ | (377) |  | ​ | (395)
Amortization of net losses |  | ​ | 202 |  | ​ | 246
Net periodic benefit cost | ​ | $ | 72 | ​ | $ | 262
​ The Company did not make a contribution to this plan during the three months ended March 31, 2021 or March 31, 2020. In October 2020, the Company amended the Retirement Income Plan to add a limited lump-sum payment window for vested terminated participants who had terminated employment before July 1, 2020 and for active employees who reached age 59 ½ by December 1, 2020, with a vested balance. The participants could elect to receive their vested balance immediately as a lump-sum or by initiating a monthly annuity payment. The lump-sum payment window offering ended during the fourth quarter of 2020 and plan assets were used to fund participant elections. The resulting non-cash settlement charges represent the accelerated recognition of actuarial losses reflected in Accumulated Other Comprehensive Income (Loss) (AOCI). A settlement loss of $4.7 million associated with the acceptance of these lump-sum payments was included as part of impairment and other charges during the fourth quarter of 2020. The Company permits selected highly compensated employees to defer a portion of their compensation into the non-qualified Supplemental Retirement Plan (“SERP”). The Company maintains certain securities primarily in mutual funds and Company owned life insurance (“COLI”) policies as a funding source to satisfy the obligation of the SERP that have been classified as trading, and are stated at fair value totaling $29.6 million as of March 31, 2021 and $32.0 million as of December 31, 2020. The SERP assets are reported in non-current other assets on the consolidated balance sheets and changes in the fair value of these assets are reported in the consolidated statements of operations as compensation cost in selling, general and administrative expenses. Trading gains, net related to the SERP assets were approximately as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ | ​ | March 31,
(in thousands) |  | 2021 |  | 2020
Trading gains (losses), net | ​ | $ | 471 | ​ | $ | (4,987)
​ The SERP liabilities includes participant deferrals net of distributions and is recorded on the consolidated balance sheets in long-term pension liabilities with any change in the fair value recorded as compensation cost within selling, general and administrative expenses in the consolidated statements of operations.

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