| (in thousands) | 2013 | 2012 | ||||||
| Deferred tax liabilities: | ||||||||
| Property and equipment | $ | 22,650 | 18,535 | |||||
| Depletion | 479 | 453 | ||||||
| Unrealized rents | 1,803 | 1,608 | ||||||
| Prepaid expenses | 1,306 | 1,913 | ||||||
| Gross deferred tax liabilities | 26,238 | 22,509 | ||||||
| Deferred tax assets: | ||||||||
| Insurance liabilities | 786 | 1,744 | ||||||
| Employee benefits and other | 2,758 | 2,508 | ||||||
| Gross deferred tax assets | 3,544 | 4,252 | ||||||
| Net deferred tax liability | $ | 22,694 | 18,257 |