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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax $ 89,407 $ 111,803 $ 202,438 $ 215,782  
Revenue Not from Contract with Customer, Other 9,702 0 9,702 0  
Revenue 99,109 111,803 212,140 215,782  
Contract liabilities 25,427   25,427   $ 1,584
Deferred Revenue, Revenue Recognized 700 900 800 1,600  
Allowance for Credit Loss          
Beginning balance 38,528   31,981    
Adoption Adjustment ASU201613     347    
Credit loss expense 6,166 5,379 12,186 10,527  
Write-offs (6,622)   (6,622)    
Recoveries collected     180    
Ending balance 38,072   38,072    
Healthcare Receivable Portfolio          
Allowance for Credit Loss          
Beginning balance 37,980   31,780    
Adoption Adjustment ASU201613     0    
Credit loss expense 6,105   12,125    
Write-offs (6,555)   (6,555)    
Recoveries collected     180    
Ending balance 37,530   37,530    
Other Receivable Portfolio          
Allowance for Credit Loss          
Beginning balance 548   201    
Adoption Adjustment ASU201613     347    
Credit loss expense 61   61    
Write-offs (67)   (67)    
Recoveries collected     0    
Ending balance 542   542    
Healthcare          
Disaggregation of Revenue          
Contract assets 9,900   9,900   15,100
Contract liabilities 23,700   23,700    
Research          
Disaggregation of Revenue          
Contract liabilities 1,700   1,700    
Corporate and Other          
Disaggregation of Revenue          
Contract assets 2,000   2,000   $ 1,700
Operating Segments | Healthcare          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 74,680   170,387    
Revenue Not from Contract with Customer, Other 9,702   9,702    
Revenue 84,382 95,004 180,089 183,013  
Operating Segments | Research          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 11,459        
Revenue Not from Contract with Customer, Other 0   0    
Revenue 11,459 13,879 25,279 26,843  
Corporate and Other          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 3,268        
Revenue Not from Contract with Customer, Other 0   0    
Revenue 3,268 2,920 6,772 5,926  
Remote Cardiac Monitoring Services - Medicare          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 33,281 36,096 73,409 70,031  
Remote Cardiac Monitoring Services - Medicare | Operating Segments | Healthcare          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 33,281 36,096 73,409 70,031  
Remote Cardiac Monitoring - Commercial Payors          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 41,399 58,908 96,978 112,982  
Remote Cardiac Monitoring - Commercial Payors | Operating Segments | Healthcare          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 41,399 58,908 96,978 112,982  
Clinical Trial Support and Related Services          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 11,459 13,879 25,279 26,843  
Clinical Trial Support and Related Services | Operating Segments | Research          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 11,459 13,879 25,279 26,843  
Technology Devices Consumables and Related Services          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax 3,268 2,920 6,772 5,926  
Technology Devices Consumables and Related Services | Corporate and Other          
Disaggregation of Revenue          
Revenue from Contract with Customer, Excluding Assessed Tax $ 3,268 $ 2,920 $ 6,772 $ 5,926