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EMPLOYEE BENEFIT PLAN | 6 Months Ended
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Jun. 30, 2020
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 employers Retirement Income Plan: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Interest cost | ​ | $ | 412 | ​ | $ | 490 | ​ | $ | 823 | ​ | $ | 980
Expected return on plan assets | ​ |  | (396) | ​ |  | (650) | ​ |  | (791) | ​ |  | (1,300)
Amortization of net losses | ​ |  | 247 | ​ |  | 230 | ​ |  | 493 | ​ |  | 460
Net periodic benefit cost | ​ | $ | 263 | ​ | $ | 70 | ​ | $ | 525 | ​ | $ | 140
​ The Company did not make a contribution to this plan during the six months ended June 30, 2020 or June 30, 2019. 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 in the SERP that have been classified as trading, and are stated at fair value totaling $27,520,000 as of June 30, 2020 and $28,476,000 as of December 31, 2019. 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 (losses), net related to the SERP assets were approximately as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Trading gains (losses), net | ​ | $ | 4,029 | ​ | $ | 785 | ​ | $ | (958) | ​ | $ | 3,636
​ The SERP liability 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 of the liabilities recorded as compensation cost within selling, general and administrative expenses in the consolidated statements of operations.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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