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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivables, reserve $ 57 $ 84
Other intangible assets, accumulated amortization 5,059 4,630
Property and equipment, accumulated depreciation $ 69,144 $ 64,210
Treasury stock, shares 8,610,766 7,515,773
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