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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Receivables, reserve $ 191 $ 50
Intangible Assets, accumulated amortization 14,240 11,203
Property and Equipment, accumulated depreciation 89,356 $ 89,937
Right-of-Use Assets, accumulated amortization $ 3,315  
Treasury stock, shares 8,264,583 8,702,074
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 Shares    
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