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Fair Value Measurements Schedule of Fair Value, Assets and Liabilities Measure on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial Liabilities:    
Derivative financial instruments $ 400  
Fair Value, Recurring    
Financial Assets:    
Derivative assets   $ 4
Total financial assets 17,806 17,655
Financial Liabilities:    
Derivative financial instruments 365 49
SERP liabilities 6,708 6,645
Total financial liabilities 7,073 6,694
Fair Value, Recurring | Corporate bonds    
Financial Assets:    
Trading debt securities 5,581 5,117
Fair Value, Recurring | Municipal bonds    
Financial Assets:    
Trading debt securities 1,147 1,154
Fair Value, Recurring | Floating rate notes    
Financial Assets:    
Trading debt securities 356 535
Fair Value, Recurring | U.S. government securities    
Financial Assets:    
Trading debt securities 2,078 2,035
Fair Value, Recurring | Asset backed securities    
Financial Assets:    
Trading debt securities 2,394 2,316
Fair Value, Recurring | Other    
Financial Assets:    
Trading debt securities 1,362 1,585
Fair Value, Recurring | Preferred stocks    
Financial Assets:    
Trading equity securities 268 282
Fair Value, Recurring | Supplemental Employee Retirement Plan | Money Market Funds    
Financial Assets:    
Trading equity securities 229 208
Fair Value, Recurring | Supplemental Employee Retirement Plan | Mutual Fund    
Financial Assets:    
Trading equity securities 4,391 4,419
Fair Value, Recurring | Level 1    
Financial Assets:    
Derivative assets   0
Total financial assets 12,903 13,069
Financial Liabilities:    
Derivative financial instruments 0 0
SERP liabilities 0 0
Total financial liabilities 0 0
Fair Value, Recurring | Level 1 | Corporate bonds    
Financial Assets:    
Trading debt securities 5,581 5,117
Fair Value, Recurring | Level 1 | Municipal bonds    
Financial Assets:    
Trading debt securities 0 0
Fair Value, Recurring | Level 1 | Floating rate notes    
Financial Assets:    
Trading debt securities 356 535
Fair Value, Recurring | Level 1 | U.S. government securities    
Financial Assets:    
Trading debt securities 2,078 2,035
Fair Value, Recurring | Level 1 | Asset backed securities    
Financial Assets:    
Trading debt securities 0 0
Fair Value, Recurring | Level 1 | Other    
Financial Assets:    
Trading debt securities 0 473
Fair Value, Recurring | Level 1 | Preferred stocks    
Financial Assets:    
Trading equity securities 268 282
Fair Value, Recurring | Level 1 | Supplemental Employee Retirement Plan | Money Market Funds    
Financial Assets:    
Trading equity securities 229 208
Fair Value, Recurring | Level 1 | Supplemental Employee Retirement Plan | Mutual Fund    
Financial Assets:    
Trading equity securities 4,391 4,419
Fair Value, Recurring | Level 2    
Financial Assets:    
Derivative assets   4
Total financial assets 4,903 4,586
Financial Liabilities:    
Derivative financial instruments 365 49
SERP liabilities 6,708 6,645
Total financial liabilities 7,073 6,694
Fair Value, Recurring | Level 2 | Corporate bonds    
Financial Assets:    
Trading debt securities 0 0
Fair Value, Recurring | Level 2 | Municipal bonds    
Financial Assets:    
Trading debt securities 1,147 1,154
Fair Value, Recurring | Level 2 | Floating rate notes    
Financial Assets:    
Trading debt securities 0 0
Fair Value, Recurring | Level 2 | U.S. government securities    
Financial Assets:    
Trading debt securities 0 0
Fair Value, Recurring | Level 2 | Asset backed securities    
Financial Assets:    
Trading debt securities 2,394 2,316
Fair Value, Recurring | Level 2 | Other    
Financial Assets:    
Trading debt securities 1,362 1,112
Fair Value, Recurring | Level 2 | Preferred stocks    
Financial Assets:    
Trading equity securities 0 0
Fair Value, Recurring | Level 2 | Supplemental Employee Retirement Plan | Money Market Funds    
Financial Assets:    
Trading equity securities 0 0
Fair Value, Recurring | Level 2 | Supplemental Employee Retirement Plan | Mutual Fund    
Financial Assets:    
Trading equity securities $ 0 $ 0