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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Capitalization    
Common stock, shares authorized (in shares) 1,000,000 1,000,000
Common stock, par value (in dollars per share) $ 100 $ 100
Common stock, shares outstanding (in shares) 933,000 933,000