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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financial Liabilities [Abstract]    
Amount of investments, Level 1 to Level 2 transfer amount $ 0  
Amount of investments, Level 2 to Level 1 transfer amount 0  
Measured at Fair Value on a Recurring Basis [Member]    
Financial Assets [Abstract]    
Derivative financial instruments 443 $ 333
Total financial assets 16,026 17,169
Financial Liabilities [Abstract]    
SERP liabilities 5,857 6,641
Total financial liabilities 5,857 6,641
Measured at Fair Value on a Recurring Basis [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 4,429 5,398
Measured at Fair Value on a Recurring Basis [Member] | Municipal Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 1,358 1,546
Measured at Fair Value on a Recurring Basis [Member] | Floating Rate Notes [Member]    
Financial Assets [Abstract]    
Trading debt securities 612 1,300
Measured at Fair Value on a Recurring Basis [Member] | U.S. Government Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 2,035 2,210
Measured at Fair Value on a Recurring Basis [Member] | Asset Backed Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 1,265 442
Measured at Fair Value on a Recurring Basis [Member] | Other [Member]    
Financial Assets [Abstract]    
Trading debt securities 1,285 708
Measured at Fair Value on a Recurring Basis [Member] | Preferred Stocks [Member]    
Financial Assets [Abstract]    
Trading equity securities 282 248
Measured at Fair Value on a Recurring Basis [Member] | Supplemental Employee Retirement Plan [Member] | Money Market Fund [Member]    
Financial Assets [Abstract]    
Trading equity securities 278 229
Measured at Fair Value on a Recurring Basis [Member] | Supplemental Employee Retirement Plan [Member] | Mutual Funds [Member]    
Financial Assets [Abstract]    
Trading equity securities 4,039 4,755
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets [Abstract]    
Derivative financial instruments 0 0
Total financial assets 11,998 14,140
Financial Liabilities [Abstract]    
SERP liabilities 0 0
Total financial liabilities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 4,429 5,398
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Municipal Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Floating Rate Notes [Member]    
Financial Assets [Abstract]    
Trading debt securities 612 1,300
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | U.S. Government Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 2,035 2,210
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Asset Backed Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Other [Member]    
Financial Assets [Abstract]    
Trading debt securities 323 0
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Preferred Stocks [Member]    
Financial Assets [Abstract]    
Trading equity securities 282 248
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Supplemental Employee Retirement Plan [Member] | Money Market Fund [Member]    
Financial Assets [Abstract]    
Trading equity securities 278 229
Measured at Fair Value on a Recurring Basis [Member] | Level 1 [Member] | Supplemental Employee Retirement Plan [Member] | Mutual Funds [Member]    
Financial Assets [Abstract]    
Trading equity securities 4,039 4,755
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member]    
Financial Assets [Abstract]    
Derivative financial instruments 443 333
Total financial assets 4,028 3,029
Financial Liabilities [Abstract]    
SERP liabilities 5,857 6,641
Total financial liabilities 5,857 6,641
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Municipal Bonds [Member]    
Financial Assets [Abstract]    
Trading debt securities 1,358 1,546
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Floating Rate Notes [Member]    
Financial Assets [Abstract]    
Trading debt securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | U.S. Government Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Asset Backed Securities [Member]    
Financial Assets [Abstract]    
Trading debt securities 1,265 442
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Other [Member]    
Financial Assets [Abstract]    
Trading debt securities 962 708
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Preferred Stocks [Member]    
Financial Assets [Abstract]    
Trading equity securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Supplemental Employee Retirement Plan [Member] | Money Market Fund [Member]    
Financial Assets [Abstract]    
Trading equity securities 0 0
Measured at Fair Value on a Recurring Basis [Member] | Level 2 [Member] | Supplemental Employee Retirement Plan [Member] | Mutual Funds [Member]    
Financial Assets [Abstract]    
Trading equity securities $ 0 $ 0