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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 3 Months Ended
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Mar. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 14. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (“AOCI”) for the three months ended March 31, 2021 and 2020 is comprised of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Foreign Currency | ​ | ​ | ​
​ | ​ | Defined Benefit | ​ | ​ | ​ | Tax effect of | ​ | Translation | ​ | ​ | ​
​ |  | Plan Liability |  | Cash Flow Hedges |  | Cash Flow Hedges |  | Adjustment |  | Total
At December 31, 2020 | ​ | $ | (1,633) | ​ | $ | (1,889) | ​ | $ | 451 | ​ | $ | (216) | ​ | $ | (3,287)
Unrealized gain on cash flow hedges | ​ | ​ | — | ​ | ​ | 704 | ​ | ​ | (167) | ​ | ​ | — | ​ | ​ | 537
Amounts reclassified from AOCI | ​ | ​ | — | ​ | ​ | 225 | ​ | ​ | (54) | ​ | ​ | — | ​ | ​ | 171
Foreign currency translation loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,007) | ​ | ​ | (4,007)
At March 31, 2021 | ​ | $ | (1,633) | ​ | $ | (960) | ​ | $ | 230 | ​ | $ | (4,223) | ​ | $ | (6,586)
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Foreign Currency | ​ | ​ | ​
​ | ​ | Defined Benefit | ​ | ​ | ​ | Tax effect of | ​ | Translation | ​ | ​ | ​
​ |  | Plan Liability |  | Cash Flow Hedges |  | Cash Flow Hedges |  | Adjustment |  | Total
At December 31, 2019 | ​ | $ | (1,628) | ​ | $ | (363) | ​ | $ | 86 | ​ | $ | (8,626) | ​ | $ | (10,531)
Unrealized loss on cash flow hedges | ​ | ​ | — | ​ | ​ | (1,463) | ​ | ​ | 351 | ​ | ​ | — | ​ | ​ | (1,112)
Amounts reclassified from AOCI | ​ | ​ | — | ​ | ​ | 31 | ​ | ​ | (7) | ​ | ​ | — | ​ | ​ | 24
Foreign currency translation loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,428) | ​ | ​ | (2,428)
At March 31, 2020 | ​ | $ | (1,628) | ​ | $ | (1,795) | ​ | $ | 430 | ​ | $ | (11,054) | ​ | $ | (14,047)
​ The realized losses relating to the Company’s interest rate swap hedges were reclassified from accumulated other comprehensive income (loss) and included in interest expense in the condensed consolidated statements of income and comprehensive income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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