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Other Long-Term Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Other Long-Term Assets. |
Schedule of Other Long-Term Assets | Other long-term assets consisted of the following at December 31 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 |  | December 31, 2021
Cash surrender value of corporate-owned life insurance policies | ​ | $ | 4,274 | ​ | $ | 5,276
Deferred commissions (1) | ​ |  | 93,213 | ​ |  | 54,028
Restricted cash | ​ |  | 54 | ​ |  | 57
Operating lease assets | ​ |  | 38,370 | ​ |  | 23,270
Deferred implementation costs (2) | ​ | ​ | 3,045 | ​ | ​ | 3,915
Prepaid expenses, deposits and other | ​ | ​ | 20,660 | ​ | ​ | 11,701
Total other long-term assets | ​ | $ | 159,616 | ​ | $ | 98,247
​ ​
(1) | Represents the incremental costs of obtaining contracts with customers, which consist primarily of sales commissions. These costs are ascribed to or allocated to the underlying performance obligations in the contracts and amortized
| consistent with the recognition timing of the revenue for the underlying performance obligations. See Note 2 “Costs to Obtain a Contract”.
(2) | During the year ended December 31, 2021, we completed an implementation of several software-as-a-service applications supporting our internal operations. Following the implementation, we placed $4.3 million of deferred implementation costs assets related to these applications into service.

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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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