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Organization and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 06, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Assets |  |  |  |  |
Deferred compensation plan assets |  | $ 15,053 | $ 15,053 | $ 11,716 |
Investments in privately held companies |  | 17,129 | 17,129 | 22,530 |
Long-term notes receivable |  | 2,722 | 2,722 | 13,504 |
Other |  | 6,557 | 6,557 | 9,829 |
Total Other Assets |  | 41,461 | 41,461 | 57,579 |
Impairment and other charges |  |  | 23,750 | $ 657 | $ 809
NinePoint Medical, Inc. |  |  |  |  |
Other Assets |  |  |  |  |
Option to purchase outstanding equity, up to | 100.00% |  |  |  |
Total purchase price | $ 10,000 |  |  |  |
Loan from acquisition | $ 10,500 |  |  |  |
Interest rate on loan | 9.00% |  |  |  |
Impairment and other charges |  | 20,500 | 20,500 |  |
Write off of accrued interest |  | $ (1,600) | $ (1,600) |  |

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