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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance | The table below summarizes the activity in the Company’s allowance for losses for the years ended December 31 (in thousands).
| Balance at Beginning of Year |  | Additions Charged to Expense |  | Deductions from the Reserve |  | Reclassification to Accounts Payable and Accrued Liabilities (1) |  | Balance at End of Year
2020 | $ | 8,000 |  |  | $ | 16,000 |  |  | $ | (14,000) |  |  | $ | — |  |  | $ | 10,000 |
2019 | $ | 7,700 |  |  | $ | 14,000 |  |  | $ | (13,700) |  |  | $ | — |  |  | $ | 8,000 |
2018 | $ | 12,700 |  |  | $ | 12,500 |  |  | $ | (11,300) |  |  | $ | (6,200) |  |  | $ | 7,700 |
(1) The allowance for losses at December 31, 2017 included $6.2 million that was attributable to the Company’s revenue reserve. As a result of the Company’s adoption of ASC 606 on January 1, 2018, the revenue reserve balance is now included in Accounts payable and accrued liabilities on the Consolidated Balance Sheets. Note 9 — Revenue and Related Matters provides additional information regarding the Company’s adoption of ASC 606.

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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