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Employee Benefit Plans (Change on Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:      
Benefit Obligation, beginning of year $ 24,511 $ 22,530  
Service Cost 4,351 5,153 $ 1,749
Interest Cost 1,340 862 267
Plan Amendment 6,569 0  
Actuarial (Gain) Loss 5,981 (3,816)  
Benefits Paid (461) (218)  
Benefit Obligation, end of year 42,291 24,511 22,530
Change in plan assets:      
Fair Value of Plan Assets, beginning of year 15,716 13,306  
Actual Return (loss) on Plan Assets 4,025 (1,300)  
Employer Contributions 4,771 3,928  
Benefits Paid (461) (218)  
Fair Value of Plan assets, end of year 24,051 15,716 $ 13,306
Funded Status at end of period (18,240) (8,795)  
Amounts recognized in the Consolidated Balance Sheet:      
Non-current assets 0 0  
Current liabilities 0 0  
Non-current Liabilities (18,240) (8,795)  
Net Liability at end of year (18,240) (8,795)  
Amounts recognized in accumulated other comprehensive income (loss):      
Prior Service Cost 6,163 0  
Net actuarial (gain) loss 2,268 (939)  
Amounts recognized in accumulated other comprehensive income ( loss:) $ 8,431 $ (939)