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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Activity in Allowance for Doubtful Accounts | Activity in the allowance for doubtful accounts is as follows (in thousands):
Allowance for doubtful accounts |  | Balance at beginning of period |  |  | Additions/ charges |  |  | Deductions (1) |  |  | Balance at end of period |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 962 |  |  |  | 918 |  |  |  | 907 |  |  | $ | 973 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 945 |  |  |  | 343 |  |  |  | 326 |  |  | $ | 962 |
Year ended December 31, 2018 (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 18,749 |  |  |  | 272 |  |  |  | 18,076 |  |  | $ | 945 |
(1)Write-offs, net of recoveries
| (2) | With the adoption of ASU 2014-09, Revenue from Contracts with Customers, in 2018 and subsequent periods, subsequent adjustments that are determined to be the result of an adverse change in the payor’s ability to pay are recognized as provision for doubtful accounts. We recorded $18.0 million for the year ended December 31, 2018 as a reduction to revenue that would have been recorded as provision for doubtful accounts under the prior revenue recognition guidance.
Estimated Useful Lives of Property and Equipment | The estimated useful lives of the property and equipment are as follows:
Computer equipment |  | 3-5 years
Furniture and equipment |  | 5-7 years
Transportation equipment |  | 5 years
Computer software |  | 3-10 years
Leasehold improvements |  | Lesser of useful life or lease term

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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