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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets    
Allowances for receivables $ 0 $ 0
Stockholders' equity    
Treasury shares (in shares) 583,508 0
Class A [Member]    
Stockholders' equity    
Common stock, shares issued (in shares) 24,820,003 23,607,096
Shares outstanding (in shares) 24,236,495 23,607,096
Class B [Member]    
Stockholders' equity    
Common stock, shares issued (in shares) 144,342,572 144,342,572
Shares outstanding (in shares) 144,342,572 144,342,572