GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Other Intangible Assets

Activity in goodwill for the years ended December 31, 2019 and December 31, 2020 is provided below (in thousands):

Balance as of December 31, 2018	$418,093
Adjustments to our preliminary allocation of the purchase price of Medical Arts Radiological Group, P.C.	722
Goodwill acquired through the acquisition of certain assets of Dignity Health	1
Goodwill acquired through the acquisition of certain assets of West Valley Imaging Center, LLC	2,490
Goodwill disposed through sale of assets	(123)
Goodwill acquired by Lenox Hill Radiology through the membership purchase of HVRA	3,125
Goodwill acquired through the acquisition of certain assets of Kern Radiology, Inc.	10,507
Goodwill acquired through the acquisition of certain assets of Zilkha Radiology, Inc.	2,577
Goodwill acquired through the acquisition of certain assets of Ramic Mahwah, LLC	231
Goodwill acquired through the acquisition of GSRN	2,021
Goodwill acquired through the acquisition of Nulogix	1,337
Goodwill transferred from assets held for sale	992
Balance as of December 31, 2019	$441,973
Goodwill acquired through the acquisition of Olney Open MRI, LLC	601
Goodwill acquired through the acquisition of MRI at Woodbridge, LLC	1,833
Goodwill acquired through the acquisition of DeepHealth, Inc.	23,299
Goodwill acquired through the acquisition of AZ-Tech Radiology & Open MRI, LLC	2,882
Goodwill acquired through the acquisition of ZP Ozone Park, LLC	828
Goodwill acquired through the acquisition of ZP Elmhurst LLC	1,463
Balance as of December 31, 2020	$472,879

Schedule of Annual Amortization Expense

The following table shows annual amortization expense, by asset classes that will be recorded over the next five years (in thousands): 

	2021		2022		2023		2024		2025		Thereafter		Total		Weighted average amortization period remaining in years
Management Service Contracts	$	2,287	$	2,287	$	2,287	$	2,287	$	2,287	$	13,533	$	24,968	10.9
Covenant not to compete and other contracts	1,024		994		883		467		233		—		3,601		3.9
Developed Technology	244		142		—		—		—		—		386		1.6
Trade Names amortized	75		75		66		64		64		309		653		5.4
Trade Names indefinite life	—		—		—		—		—		7,100		7,100		—
Software in development	—		—		—		—		—		15,685		15,685		—
Total Annual Amortization	$	3,630	$	3,498	$	3,236	$	2,818	$	2,584	$	36,627	$	52,393