Accrued liabilities consisted of the following: | | | | | | | | | (in thousands) | June 30, 2019 | | December 31, 2018 | Accrued salaries and other compensation | $ | 3,157 |
| | $ | 12,379 |
| Insurance | 2,930 |
| | 5,464 |
| Deferred revenues (contract liabilities) | 730 |
| | 1,374 |
| Property and other taxes | 3,224 |
| | 3,829 |
| Intangible liability | — |
| | 1,079 |
| Interest | 3,370 |
| | 3,318 |
| Operating lease liability - current | 421 |
| | — |
| Other | 2,225 |
| | 1,776 |
| | $ | 16,057 |
| | $ | 29,219 |
|
|