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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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