Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - changes in benefit obligation, changes in plan assets, the funded status (Details)

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EMPLOYEE BENEFIT PLANS - changes in benefit obligation, changes in plan assets, the funded status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in Projected Benefit Obligation:      
Actuarial Loss (Gain) $ 7,642 $ 815 $ 3,470
Components of Net Periodic Benefit Costs:      
Amortization of Prior Service Costs 15 199 223
Net Loss Amortization (4,623) (5,299) (4,409)
Net Periodic Benefit Cost (3,004) 4,683 1,162
Defined benefit pension plan [Member]      
Change in Projected Benefit Obligation:      
Benefit Obligation at Beginning of Year 149,347 165,084 152,585
Service Cost 6,114 6,884 6,752
Interest Cost 6,178 5,661 5,750
Actuarial Loss (Gain) 25,715 (16,349) 10,877
Benefits Paid (6,255) (11,686) (10,541)
Expenses Paid (269) (247) (339)
Projected Benefit Obligation at End of Year 180,830 149,347 165,084
Change in Plan Assets:      
Fair Value of Plan Assets at Beginning of Year 134,535 129,719 113,813
Actual Return on Plan Assets 28,635 (6,251) 16,786
Employer Contributions 5,000 23,000 10,000
Benefits Paid (6,255) (11,686) (10,541)
Expenses Paid (269) (247) (339)
Fair Value of Plan Assets at End of Year 161,646 134,535 129,719
Funded Status of Plan and Accrued Liability Recognized at End of Year:      
Other Liabilities 19,184 14,812 35,365
Accumulated Benefit Obligation at End of Year 156,327 130,477 144,139
Components of Net Periodic Benefit Costs:      
Service Cost 6,114 6,884 6,752
Interest Cost 6,178 5,661 5,750
Expected Return on Plan Assets (9,527) (9,564) (8,026)
Amortization of Prior Service Costs 15 199 223
Net Loss Amortization 3,862 3,673 3,812
Net Periodic Benefit Cost $ 6,642 $ 6,853 $ 8,511
Weighted-average assumptions used to determine benefit obligations:      
Discount Rate (in percent) 3.53% 4.43% 3.71%
Rate of Compensation Increase (in percent) 4.00% 4.00% 3.25%
Measurement Date Dec. 31, 2019 Dec. 31, 2018 Dec. 31, 2017
Weighted-Average Assumptions Used to Determine Benefit Cost:      
Discount Rate (in percent) 4.43% 3.71% 4.21%
Expected Return on Plan Assets (in percent) 7.25% 7.25% 7.25%
Rate of Compensation Increase (in percent) 4.00% 3.25% 3.25%
Amortization Amounts from Accumulated Other Comprehensive Income:      
Net Actuarial Loss $ 6,606 $ (533) $ 2,117
Prior Service Cost (15) (199) (223)
Net Loss (3,862) (3,673) (3,812)
Deferred Tax (Benefit) Expense (694) 1,118 5,898
Other Comprehensive Loss, net of tax 2,035 (3,287) 3,980
Amounts Recognized in Accumulated Other Comprehensive Income:      
Net Actuarial Losses 37,235 34,491 38,698
Prior Service Cost 50 66 265
Deferred Tax Liability (Benefit) (9,451) (8,757) (9,876)
Accumulated Other Comprehensive Loss (Gain), net of tax $ 27,834 $ 25,800 $ 29,087