| 8. | INCOME TAXES |
| 2017 | 2016 | 2015 | ||||||||||
| Current: | ||||||||||||
| Federal | $ | 23,327 | $ | 12,630 | $ | 11,710 | ||||||
| State | 436 | 262 | 606 | |||||||||
23,763 | 12,892 | 12,316 | ||||||||||
| Deferred: | ||||||||||||
| Federal | (127,310 | ) | 8,604 | (26,440 | ) | |||||||
| State | (328 | ) | 155 | 2,245 | ||||||||
(127,638 | ) | 8,759 | (24,195 | ) | ||||||||
| Total | $ | (103,875 | ) | $ | 21,651 | $ | (11,879 | ) | ||||
| 2017 | 2016 | 2015 | ||||||||||
| Statutory federal tax rate | 35.0 | % | 35.0 | % | 35.0 | % | ||||||
| State and local income taxes, net of federal income tax effect | 2.2 | 1.8 | 3.4 | |||||||||
| Non- deductible executive compensation | 1.6 | – | – | |||||||||
| Change in valuation allowances | 0.1 | 0.6 | 22.6 | |||||||||
| Change in uncertain tax positions, including income tax liabilities for settlements with taxing authorities | 0.1 | (0.2 | ) | (24.4 | ) | |||||||
| Change in federal tax rate | (270.8 | ) | – | – | ||||||||
| Change in state tax rates | (3.7 | ) | (0.9 | ) | (7.6 | ) | ||||||
| Other, net | 1.4 | (0.9 | ) | (3.3 | ) | |||||||
| Total | (234.1 | %) | 35.4 | % | 25.7 | % | ||||||
| 2017 | 2016 | |||||||
| Deferred tax liabilities: | ||||||||
| Property and equipment | $ | 140,463 | $ | 232,565 | ||||
| Goodwill and other intangible assets | 68,752 | 107,927 | ||||||
| Expenses deducted for tax purposes and other | 1,707 | 2,866 | ||||||
| Subtotal | 210,922 | 343,358 | ||||||
| Deferred tax assets: | ||||||||
| Income previously recognized for tax purposes | 2,449 | | 4,658 | |||||
| Stock option and other deferred compensation expense | 1,838 | | 3,581 | |||||
| PSL and other deferred income recognized for tax purposes | 627 | | 1,072 | |||||
| State and federal net operating loss carryforwards | 6,188 | | 6,397 | | ||||
| Subtotal | 11,102 | | 15,708 | | ||||
| Less: valuation allowance | (1,940 | ) | (1,748 | ) | ||||
| Net deferred tax assets | 9,162 | | 13,960 | | ||||
| Total net deferred tax liabilities | $ | 201,760 | $ | 329,398 | ||||
| 2017 | 2016 | 2015 | ||||||||||
| Beginning of period | $ | 12,006 | $ | 12,280 | $ | 885 | ||||||
| Increases (decreases) for tax positions of current year | – | – | 11,781 | |||||||||
| Increases for tax positions of prior years | – | – | – | |||||||||
| Decreases for tax positions of prior years | (295 | ) | (274 | ) | (386 | ) | ||||||
| Reductions for lapse of applicable statute of limitations | – | – | – | |||||||||
| Increases (decreases) for settlements with taxing authorities | – | – | – | |||||||||
| End of period | $ | 11,711 | $ | 12,006 | $ | 12,280 | ||||||