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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Statement of Financial Position [Abstract] |  |
Allowance for uncollectible accounts | $ 1,146 | $ 1,120
Common stock, par value (in usd per share) | $ 0.4867 | $ 0.4867
Common stock, shares authorized | 25,000,000 | 25,000,000

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