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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables, reserve $ 84 $ 59
Treasury stock, shares 7,515,773 5,411,429
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
Common 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
Common stock, shares outstanding 101,989,683 104,094,027