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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 1,584				$ 3,080				$ 1,584	$ 3,080
Revenue	112,034	$ 111,291	$ 111,803	$ 103,979	103,603	$ 100,013	$ 101,360	$ 94,496	439,107	399,472	$ 286,776
Deferred Revenue, Revenue Recognized									2,000	3,100
Healthcare
Disaggregation of Revenue [Line Items]
Contract assets	15,100				2,100				15,100	2,100
Corporate and Other
Disaggregation of Revenue [Line Items]
Contract assets	$ 1,700				$ 200				1,700	200
Revenue									12,643	10,099
Operating Segments \| Healthcare
Disaggregation of Revenue [Line Items]
Revenue									372,014	338,812	234,385
Operating Segments \| Research
Disaggregation of Revenue [Line Items]
Revenue									54,450	50,561	38,790
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue									12,643	10,099	$ 13,601
Remote Cardiac Monitoring Services - Medicare
Disaggregation of Revenue [Line Items]
Revenue									153,743	137,600
Remote Cardiac Monitoring Services - Medicare \| Operating Segments \| Healthcare
Disaggregation of Revenue [Line Items]
Revenue									153,743	137,600
Remote Cardiac Monitoring Services - Commercial Payors
Disaggregation of Revenue [Line Items]
Revenue									218,271	201,212
Remote Cardiac Monitoring Services - Commercial Payors \| Operating Segments \| Healthcare
Disaggregation of Revenue [Line Items]
Revenue									218,271	201,212
Clinical Trial Support and Related Services
Disaggregation of Revenue [Line Items]
Revenue									54,450	50,561
Clinical Trial Support and Related Services \| Operating Segments \| Research
Disaggregation of Revenue [Line Items]
Revenue									54,450	50,561
Technology Devices Consumables and Related Services
Disaggregation of Revenue [Line Items]
Revenue									12,643	10,099
Technology Devices Consumables and Related Services \| Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue									$ 12,643	$ 10,099