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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables, reserve $ 11 $ 60
Intangible Assets, accumulated amortization 8,370 5,202
Property and Equipment, accumulated depreciation $ 86,546 $ 70,561
Treasury stock, shares 9,014,276 8,405,003
Class A    
Common stock, no par value (usd per share) $ 0 $ 0
Common stock, shares authorized 20,000 20,000
Common stock, shares issued 9,000 9,000
Common stock, shares outstanding 9,000 9,000
Class B    
Common stock, no par value (usd per share) $ 0 $ 0
Common stock, shares authorized 900,000,000 900,000,000
Common stock, shares issued 109,505,456 109,505,456