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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables, reserve $ 11 $ 60
Other Intangible Assets, accumulated amortization 5,489 5,202
Property and Equipment, accumulated depreciation $ 75,803 $ 70,561
Treasury Stock, Shares 8,742,294 8,405,003
Class A [Member]    
Common Stock, No Par Value $ 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 [Member]    
Common Stock, No Par Value $ 0 $ 0
Common Stock, Shares Authorized 900,000,000 900,000,000
Common Stock, Shares Issued 109,505,456 109,505,456