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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Stockholders' Equity Note [Abstract]                
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (223,206) $ (218,612) $ (223,206) $ (218,612) $ (206,529) $ (194,151) $ (223,988) $ (192,507)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax, Parent 54 (17) 319 (215)        
AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax (94) (215) (94) (215) (148) (413) (198) 0
Currency translation adjustments (16,677) 5,376 (29,055) (26,105)        
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (20,328) 24,221 (20,328) 24,221 21,125 (22,690) 24,796 26,144
Amortization of unrecognized losses and prior service cost, net of tax (797) (575) 2,362 (1,923)        
Accumulated other comprehensive loss (243,628) (243,048) (243,628) (243,048) $ (227,802) $ (217,254) $ (248,982) $ (218,651)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax $ (42) $ 45 $ (83) $ 65