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Noncontrolling Interests Subject to Put Provisions and Other Commitments - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Epogen |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Long term purchase commitment, expiration date | Dec. 31, 2022 |  |  |
Dialysis Equipment, Parts and Supplies |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Long term purchase commitment, expiration date |  | Dec. 31, 2020 |  |
Purchase commitment, purchase during the period |  | $ 182,446 | $ 176,212 | $ 164,766
Hemodialysis Products, Supplies and Equipment |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Purchase commitment, purchase during the period |  | $ 162,858 | $ 166,764 | $ 162,109
Minimum |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Scheduled dissolution term of joint ventures |  | 10 years |  |
Minimum | Epogen |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Long-term purchase commitment, percentage of quantity required | 90.00% |  |  |
Maximum |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Scheduled dissolution term of joint ventures |  | 50 years |  |
Commitments to Provide Operating Capital |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Other potential commitments to provide operating capital to several dialysis centers |  | $ 4,675 |  |

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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