Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Narratives) (Details)

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Summary of Significant Accounting Policies (Narratives) (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
boardMember
Dec. 31, 2023
USD ($)
reportingUnit
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Non-controlling Interest        
Prepaid expenses and other current assets   $ 51,472,000 $ 47,422,000  
Other assets   126,723,000 107,830,000  
Property and equipment, net   (48,223,000) (48,481,000)  
Direct expense   473,038,000 470,424,000 $ 423,723,000
General and administrative   210,113,000 218,831,000 171,657,000
Depreciation and amortization   (130,304,000) (125,828,000) (117,767,000)
Net cash provided by operating activities   (154,868,000) (98,355,000) (250,577,000)
Net cash used in financing activities   72,706,000 108,320,000 29,170,000
Allowance for doubtful accounts receivable, current   2,300,000 2,600,000  
Impairment of investments   $ 2,000,000 0 0
Impairment of property and equipment     5,100,000  
Number of reporting units | reportingUnit   2    
Goodwill impairment   $ 191,818,000 0 0
Intangible asset impairment charges   0 0 0
Investment in private companies   $ 4,175,000 16,351,000 $ 25,926,000
Number of board members | boardMember 2      
Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag   impairments of property and equipment    
Private Services Company        
Non-controlling Interest        
Ownership interest (as a percent) 43.00%      
Investment in private companies $ 1,300,000      
Revision of Prior Period, Error Correction, Adjustment        
Non-controlling Interest        
Prepaid expenses and other current assets     6,100,000  
Other assets     7,900,000  
Property and equipment, net     14,000,000  
Direct expense     2,000,000  
General and administrative     2,700,000  
Depreciation and amortization     4,700,000  
Net cash provided by operating activities     18,700,000  
Net cash used in financing activities     $ 18,700,000