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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Net Revenue by Service Line

The following table summarizes the Company’s net revenue from continuing operations by service line (in percentages):

		Years Ended December 31,
		2019				2018				2017
Women’s and Children’s services			50	%			49	%			50	%
Anesthesiology and related			36	%			38	%			41	%
Radiology			14	%			13	%			9	%
			100	%			100	%			100	%

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents information about the Company’s financial instruments that are accounted for at fair value on a recurring basis at December 31, 2019 and 2018 (in thousands):

						Fair Value
		Fair Value Category				December 31, 2019				December 31, 2018
Assets:
Money market funds			Level 1			$	16,775			$	481
Short-term investments			Level 2				74,510				—	(1)
Company-owned life insurance			Level 2				—				10,464
Mutual funds			Level 1				14,264				—
Liabilities:
Contingent consideration			Level 3				2,696				20,039

(1) Investments were measured at carrying value as of December 31, 2018. See table below.

Financial Instruments Measured At Carrying Amount

The following table presents information about the Company’s financial instruments that are not carried at fair value at December 31, 2019 and 2018 (in thousands):

		December 31, 2019								December 31, 2018
		Carrying Amount				Fair Value				Carrying Amount				Fair Value
Assets:
Short-term investments		$	—	(2)		$	—	(2)			21,923				21,858
Long-term investments			—	(2)			—	(2)			69,699				69,090
Liabilities:
2023 Notes			750,000				766,875				750,000				736,725
2027 Notes			1,000,000				1,025,600				500,000				482,500

(2) Investments were measured at fair value as of December 31, 2019. See table above.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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