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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
AOCI - Beginning Balance $ (22,844) $ (30,964) $ (20,882)
Reclassifications 1,952 2,886 1,882
AOCI - Ending Balance (36,284) (22,844) (30,964)
Accumulated Defined Benefit Pension Items      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
AOCI - Beginning Balance (22,844) (30,964) (20,882)
Other comprehensive income before reclassifications (15,392) 5,234 (7,872)
Reclassifications 1,952 2,886 1,882
Other Comprehensive Income (Loss) (13,440) 8,120 (5,990)
Cumulative effect of change in accounting principle [1] 0 0 (4,092)
AOCI - Ending Balance $ (36,284) $ (22,844) $ (30,964)
[1] The cumulative effect of change in accounting principle relates to the 2017 adoption of ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220).