XML 129 R114.htm IDEA: XBRL DOCUMENT v3.20.4
Employee benefit plans - Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) $ 7,977 $ 6,579  
Pension Benefits      
Components of net periodic pension cost:      
Interest cost 544 639 $ 623
Expected return on plan assets (1,236) (1,084) (960)
Amortization of unrecognized net gain 218 227 194
Net periodic benefit (474) (218) (143)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) 544 639 (590)
Deferred tax (114) (134) 124
Total recognized in other comprehensive loss 430 505 (466)
Total recognized in net period pension cost and other comprehensive loss $ (44) $ 287 $ (609)