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OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | $ 236,317 | $ 279,493 | $ 210,279
Currency translation adjustment | (235) | 0 | 0
Derivative fair value adjustment | (2,289) | 1,003 | 147
Net (loss) income arising from retirement benefit obligations, net of tax | 601 | 550 | (468)
Balance at end of year | 230,136 | 236,317 | 279,493
Accumulated translation adjustment: |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (34,019) | (33,727) | (27,821)
OCI, before reclassifications, net of tax, attributable to parent | (2,062) | (292) | (5,906)
Currency translation adjustment | 235 | 0 | 0
Balance at end of year | (35,846) | (34,019) | (33,727)
Accumulated deferred gains (losses) on cash flow hedges: |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | 1,164 | 161 | 14
Derivative fair value adjustment | (3,273) | 1,212 | 161
Amounts reclassified from accumulated other comprehensive loss | 984 | (209) | (14)
Balance at end of year | (1,125) | 1,164 | 161
Accumulated effect of retirement benefit obligations: |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (1,600) | (1,050) | (1,518)
Amounts reclassified from accumulated other comprehensive loss | 79 | 51 | 95
Net (loss) income arising from retirement benefit obligations, net of tax | (680) | (601) | 373
Balance at end of year | (2,201) | (1,600) | (1,050)
Accumulated other comprehensive loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of year | (34,455) | (34,616) | (29,325)
Derivative fair value adjustment | (2,289) | 1,003 | 147
Net (loss) income arising from retirement benefit obligations, net of tax | 601 | 550 | (468)
Balance at end of year | $ (39,172) | $ (34,455) | $ (34,616)

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