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Accrued Liabilities | 6 Months Ended
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Jun. 30, 2020
Accrued Liabilities |
Accrued Liabilities | 14. ACCRUED LIABILITIES ​ The following table sets forth the components of accrued liabilities, in thousands: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | June 30, | ​ | December 31,
​ |  | 2020 |  | 2019
Accrued liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Salaries, wages, and commissions | ​ | $ | 33,463 | ​ | $ | 32,154
Insurance liabilities | ​ | ​ | 22,344 | ​ | ​ | 22,506
Deferred revenue | ​ | ​ | 15,719 | ​ | ​ | 16,139
Interest payable on long-term debt | ​ | ​ | 4,134 | ​ | ​ | 3,966
Income taxes payable | ​ | ​ | 19,360 | ​ | ​ | 50
Other | ​ | ​ | 25,669 | ​ | ​ | 23,603
Total accrued liabilities | ​ | $ | 120,689 | ​ | $ | 98,418
​ See Note 3 – Revenue Recognition for discussion of our deferred revenue balances and related revenue recognition policy. ​ Income taxes payable as of June 30, 2020 increased to $19.4 million primarily as a result of the government’s response to COVID-19, which delayed the due date for certain tax payments which would have historically been paid by June 30, 2020. In the prior year, these payments were represented as prepaid expenses and other current assets on the condensed consolidated balance sheet.

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