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Other Balance Sheet And Statement Of (Loss) Earnings Captions (Other Operating Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pari-Mutuel Revenue [Member]      
Other operating revenue $ 16,937 $ 10,783 $ 4,572
Bowling Revenue [Member]      
Other operating revenue 415 885 735
Other Revenue [Member]      
Other operating revenue 11,531 7,150 5,602
Other Operating Revenue [Member]      
Other operating revenue $ 28,883 $ 18,818 $ 10,909