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Business, Basis of Presentation and Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Core Digital Media lead generation revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 4,464 $ 6,680
Professional services fees    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 3,004 3,549
Real estate network referral fees    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 11,398 9,578
Contact center    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 9,315 11,632
Closing fees    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 76,978 157,167
Appraisal revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 22,022 $ 22,491
Subscription revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 25,754