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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2019
EMPLOYEE BENEFIT PLANS. |
EMPLOYEE BENEFIT PLANS | 11. EMPLOYEE BENEFIT PLANS The Company participates in a multiple employer pension plan. The following represents the net periodic benefit cost and related components for the plan: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
(in thousands) | ​ | June 30, | ​ | June 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Interest cost | ​ | $ | 64 | ​ | $ | 62 | ​ | $ | 128 | ​ | $ | 125
Expected return on plan assets | ​ |  | (118) | ​ |  | (125) | ​ |  | (235) | ​ |  | (250)
Amortization of net losses | ​ |  | 22 | ​ |  | 21 | ​ |  | 44 | ​ |  | 41
Net periodic benefit | ​ | $ | (32) | ​ | $ | (42) | ​ | $ | (63) | ​ | $ | (84)
​ The Company did not make a contribution to this plan during the six months ended June 30, 2019. The Company permits selected highly compensated employees to defer a portion of their compensation into a non-qualified Supplemental Executive Retirement Plan (“SERP”). The Company maintains certain securities in the SERP that have been classified as trading. The SERP assets are stated at fair value and totaled approximately $6,278,000 as of June 30, 2019 and $5,518,000 as of December 31, 2018. The SERP assets are reported in other non-current assets on the consolidated balance sheets and changes to the fair value of the assets are reported in selling, general and administrative expenses in the consolidated statements of operations. Trading gains related to the SERP assets totaled approximately $738,000 during the six months ended June 30, 2019, compared to trading gains of approximately $40,000 during the six months ended June 30, 2018.

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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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