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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for uncollectible accounts | $ 1,108 | $ 936
Common stock, par value | $ 0.4867 | $ 0.4867
Common stock, shares authorized | 50,000,000 | 50,000,000
Preferred Stock, Shares Authorized | 2,000,000 | 2,000,000
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01

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