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Goodwill | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill Changes in the carrying value of goodwill by reportable segment were as follows:
| U.S. dialysis |  | Other - Ancillary services |  | Consolidated
Balance at December 31, 2020 | $ | 6,309,928 |  |  | $ | 609,181 |  |  | $ | 6,919,109 |
Acquisitions | 91,979 |  |  | 81,265 |  |  | 173,244 |
Divestitures | (1,745) |  |  | — |  |  | (1,745) |
Foreign currency and other adjustments | — |  |  | (44,367) |  |  | (44,367) |
Balance at December 31, 2021 | $ | 6,400,162 |  |  | $ | 646,079 |  |  | $ | 7,046,241 |
Acquisitions | 16,750 |  |  | 32,297 |  |  | 49,047 |
Divestitures | (87) |  |  | (3,263) |  |  | (3,350) |
Foreign currency and other adjustments | — |  |  | (15,328) |  |  | (15,328) |
Balance at December 31, 2022 | $ | 6,416,825 |  |  | $ | 659,785 |  |  | $ | 7,076,610 |
Balance at December 31, 2022: |  |  |  |  |
Goodwill | $ | 6,416,825 |  |  | $ | 778,774 |  |  | $ | 7,195,599 |
Accumulated impairment charges | — |  |  | (118,989) |  |  | (118,989) |
| $ | 6,416,825 |  |  | $ | 659,785 |  |  | $ | 7,076,610 |
The Company's operations continue to be impacted by the effects of the coronavirus (COVID-19) pandemic. While the Company does not currently expect a material adverse impact to its business as a result of the ongoing COVID-19 pandemic, there can be no assurance that the magnitude of the cumulative impacts of the COVID-19 pandemic, including certain conditions and developments in the U.S. and global economies, labor market conditions, inflation and monetary policies that may have been intensified by the pandemic, will not have a material adverse impact on one or more of the Company's businesses. Each of the Company’s operating segments described in Note 25 to these consolidated financial statements represents an individual reporting unit for goodwill impairment assessment purposes. Within the U.S. dialysis operating segment, the Company considers each of its dialysis centers to constitute an individual business for which discrete financial information is available. However, since these dialysis centers have similar operating and economic characteristics, and the allocation of resources and significant investment decisions concerning these businesses are highly centralized and the benefits broadly distributed, the Company has aggregated these centers and deemed them to constitute a single reporting unit. The Company has applied a similar aggregation to the physician practices in its physician services reporting units, to the dialysis centers and other health operations within each international reporting unit, and to the vascular access service centers in its former vascular access services reporting unit. For the Company’s other operating segments, discrete business components below the operating segment level constitute individual reporting units. When performing quantitative goodwill impairment assessments, the Company estimates fair value using either appraisals developed with an independent third party valuation firm which consider both discounted cash flow estimates for the subject business and observed market multiples for similar businesses, or offer prices received for the subject business that would be acceptable to the Company. Based on its most recent assessments, the Company determined that changes in its forecast concerning expected patient census, the timing or amount of expected reimbursement rate increases, expected treatment growth rates, or other significant adverse changes in expected future cash flows or other valuation assumptions could result in goodwill impairment charges in the future for the following reporting unit, which remains at risk of goodwill impairment as of December 31, 2022:
Reporting unit |  | Goodwill balance |  | Carrying amount coverage(1) |  | Sensitivities
Operating income(2) |  | Discount rate(3)
Germany kidney care |  | $ | 281,781 |  |  | 18.9 | % |  | (2.0) | % |  | (9.2) | %
(1)Excess of estimated fair value of the reporting unit over its carrying amount as of the latest assessment date. (2)Potential impact on estimated fair value of a sustained, long-term reduction of 3% in operating income as of the latest assessment date. (3)Potential impact on estimated fair value of an increase in discount rates of 100 basis points as of the latest assessment date. Except as described above, none of the Company’s other reporting units were considered at risk of significant goodwill impairment as of December 31, 2022. Since the dates of the Company’s last annual goodwill impairment assessments, there have been certain developments, events, changes in operating performance and other changes in key circumstances that have affected the Company’s businesses. However, these have not caused management to believe it is more likely than not that the fair values of any of the Company’s reporting units would be less than their respective carrying amounts as of December 31, 2022.

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