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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of service fee revenue

Our total net revenues for the years ended December 31, 2019, 2018, and 2017 are presented in the table below (in thousands):

	2019				2018				2017
Commercial insurance	$	642,341			$	542,011			$	534,224
Medicare	237,427				192,881				179,678
Medicaid	28,283				25,615				24,133
Workers' compensation/personal injury	42,792				34,193				32,969
Other patient revenue	23,862				25,117				29,882
Management fee revenue	11,659				13,882				13,127
Imaging on call and software	17,317				16,261				18,116
Other	24,555				18,781				25,049
Service fee revenue, net of contractual allowances and discounts	1,028,236				868,741				857,178
Provision for bad debts	—				—				(46,555		)
Net service fee revenue	1,028,236				868,741				810,623
Revenue under capitation arrangements	125,943				106,405				111,563
Total net revenue	$	1,154,179			$	975,146			$	922,186

Schedule of effect of derivative instruments on comprehensive income

For the twelve months ended December 31, 2019
Effective Interest Rate Swap	Amount of Loss Recognized on Derivative, net of taxes	Location of Loss Recognized in Income on Derivative
Interest rate contracts	$(5,870)	Other Comprehensive Loss

A tabular presentation of the effect of derivative instruments on our consolidated statement of comprehensive income (loss), net of taxes is as follows (amounts in thousands):

	Interest Rate Contracts
For the twelve months ended	Amount of (Loss) Gain Recognized on Derivative, net of taxes	Location of Loss Recognized in Income on Derivative
December 31, 2019	$(4,383)	Other Comprehensive Loss
December 31, 2018	2,876	Other Comprehensive Income
December 31, 2017	(880)	Other Comprehensive Loss

Schedule of fair value of assets and liabilities

The table below summarizes the estimated fair values of certain of our financial assets that are subject to fair value measurements, and the classification of these assets in our consolidated balance sheets, as follows (in thousands):

	As of December 31, 2019
	Level 1				Level 2				Level 3				Total
Current and long term liabilities
2016 CAPS - Interest Rate Contracts	$	—			$	1,081			$	—			$	1,081
2019 SWAPS - Interest Rate Contracts	$	—			$	9,477			$	—			$	9,477

	As of December 31, 2018
	Level 1				Level 2				Level 3				Total
Current assets
2016 CAPS - Interest Rate Contracts	$	—			$	3,316			$	—			$	3,316

The table below summarizes the estimated fair value and carrying amount of our SunTrust (Term Loan Agreement) and Barclays (First Lien Term Loans) long-term debt as follows (in thousands):

	As of December 31, 2019
	Level 1				Level 2				Level 3				Total Fair Value				Total Face Value
Term Loan Agreement and First Lien Term Loans	$	—			$	708,948			$	—			$	708,948			$	705,699

	As of December 31, 2018
	Level 1				Level 2				Level 3				Total				Total Face Value
Term Loan Agreement and First Lien Term Loans	$	—			$	633,229			$	—			$	633,229			$	646,441

Schedule of earnings per share

Earnings per share is based upon the weighted average number of shares of common stock and common stock equivalents outstanding, net of common stock held in treasury, as follows (in thousands except share and per share data):

	Years Ended December 31,
	2019				2018				2017
Net income attributable to RadNet, Inc. common stockholders	$	14,756			$	32,243			$	53
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period	49,674,858				48,114,275				46,880,775
Basic net income per share attributable to RadNet, Inc. common stockholders	$	0.30			$	0.67			$	—
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period	49,674,858				48,114,275				46,880,775
Add nonvested restricted stock subject only to service vesting	208,963				180,631				274,940
Add additional shares issuable upon exercise of stock options and warrants	360,185				384,093				246,206
Weighted average number of common shares used in calculating diluted net income per share	50,244,006				48,678,999				47,401,921
Diluted net income per share attributable to RadNet, Inc. common stockholders	$	0.29			$	0.66			$	—
Stock options excluded from the computation of diluted per share amounts:
Weighted average shares for which the exercise price exceeds average market price of common stock	—				6,250				175,037

Schedule of investment in joint ventures

The following table is a summary of our investment in joint ventures during the years ended December 31, 2019 and December 31, 2018 (in thousands):

Balance as of December 31, 2017	$	52,435
Equity contributions in existing and purchase of interest in joint ventures	2,000
Equity in earnings in these joint ventures	11,377
Disposition of equity method interest upon acquisition of control in NJIN	(2,993		)
Distribution of earnings	(24,846		)
Balance as of December 31, 2018	$	37,973
Equity contributions in existing and purchase of interest in joint ventures	103
Equity in earnings in these joint ventures	8,350
Sale of ownership interest	(134		)
Dissolution of GSRN	(1,428		)
Nulogix return of capital	(792		)
Nulogix change in control	(1,004		)
Distribution of earnings	(8,598		)
Balance as of December 31, 2019	$	34,470

Joint venture investment and financial information

The following table is a summary of key unaudited financial data for these joint ventures as of December 31, 2019 and 2018, respectively, and for the years ended December 31, 2019, 2018 and 2017, respectively, (in thousands):

	December 31,
Balance Sheet Data:	2019				2018
Current assets	$	27,427			$	28,317
Noncurrent assets	61,037				45,912
Current liabilities	(9,217		)		(4,300		)
Noncurrent liabilities	(18,872		)		(4,898		)
Total net assets	$	60,375			$	65,031
Book value of RadNet joint venture interests	$	28,001			$	30,030
Cost in excess of book value of acquired joint venture interests accounted for as equity method goodwill	6,469				7,943
Total value of RadNet joint venture interests	$	34,470			$	37,973
Total book value of other joint venture partner interests	$	32,374			$	35,001

	2019				2018				2017
Net revenue	$	108,051			$	155,820			$	188,849
Net income	$	18,624			$	24,596			$	28,644

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