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PENSION LIABILITY (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
PENSION LIABILITY |
Schedule of net funded status | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31,
​ | ​ | 2020 | ​ | 2019
Pension liability | ​ | $ | 66,538 | ​ | $ | 68,359
Schedule of net periodic pension benefit costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2020 |  | 2019 | ​
Service cost | ​ | $ | 258 | ​ | $ | — | ​
Interest cost | ​ | ​ | 480 | ​ | ​ | 199 | ​
Expected return on plan assets | ​ | ​ | (148) | ​ | ​ | (170) | ​
Amortization of actuarial gains and losses | ​ | ​ | 116 | ​ | ​ | 118 | ​
Net periodic pension cost | ​ | $ | 706 | ​ | $ | 147 | ​

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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