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Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Income tax provision on equity in earnings of affiliates $ 484 $ 357 $ 928 $ 716