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Business Combinations - Pro Forma (Details) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Zio        
Business Combination, Separately Recognized Transactions        
Revenue $ 11,419   $ 933,229 $ 830,463
Income from Operations $ 2,395   $ 38,884 $ 8,159
Star Waggons        
Business Combination, Separately Recognized Transactions        
Revenue   $ 9,651    
Income from Operations   $ 2,947