Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, value $ 941,360 $ 815,750 $ 711,908
Change during the year:      
Other comprehensive earnings/(loss) (5,514) 10,212 49,969
Ending balance, value 1,082,048 941,360 815,750
Interest Rate Swap      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, value (381) (277)  
Change during the year:      
Before-tax amount 516 (141) (277)
Tax benefit (135) 37  
Other comprehensive earnings/(loss) 381 (104) (277)
Ending balance, value   (381) (277)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, value (322) (195) (46,091)
Change during the year:      
Before-tax amount   (173) 75,449
Tax benefit   46 (29,553)
Other comprehensive earnings/(loss)   (127) 45,896
Ending balance, value (322) (322) (195)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, value (10,194) (20,637) (24,987)
Change during the year:      
Before-tax amount (5,895) 10,443 4,350
Other comprehensive earnings/(loss) (5,895) 10,443 4,350
Ending balance, value (16,089) (10,194) (20,637)
Accumulated Other Comprehensive Income/(Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, value (10,897) (21,109) (71,078)
Change during the year:      
Before-tax amount (5,379) 10,129 79,522
Tax benefit (135) 83 (29,553)
Other comprehensive earnings/(loss) (5,514) 10,212 49,969
Ending balance, value $ (16,411) $ (10,897) $ (21,109)