| Income Tax Disclosure [Text Block] |
Ìý The income tax provision charged to operations for the years ended December 31, 2017,
2016 and 2015 was as follows (in thousands): Ìý | Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | | Current: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | U.S. Federal | Ìý | $ | 46,013 | Ìý | Ìý | $ | 21,665 | Ìý | Ìý | $ | 25,030 | Ìý | | State and local | Ìý | Ìý | 851 | Ìý | Ìý | Ìý | 376 | Ìý | Ìý | Ìý | 400 | Ìý | | Ìý | Ìý | Ìý | 46,864 | Ìý | Ìý | Ìý | 22,041 | Ìý | Ìý | Ìý | 25,430 | Ìý | | Deferred benefit | Ìý | Ìý | (3,365 | ) | Ìý | Ìý | (4,194 | ) | Ìý | Ìý | (186 | ) | | Ìý | Ìý | $ | 43,499 | Ìý | Ìý | $ | 17,847 | Ìý | Ìý | $ | 25,244 | Ìý | The Trust is taxed as if it were a corporation. Total income tax expense differed from the amounts computed by applying the U.S. Federal income tax rate of 35% to income before Federal income taxes as a result of the following (in thousands):
Ìý | Ìý | Ìý | | Ìý | Ìý | | Ìý | Ìý | | Ìý | | Computed tax expense at the statutory rate | Ìý | $ | 41,951 | Ìý | Ìý | $ | 19,280 | Ìý | Ìý | $ | 26,349 | Ìý | | Reduction in income taxes resulting from: | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Statutory depletion | Ìý | Ìý | (3,378 | ) | Ìý | Ìý | (1,609 | ) | Ìý | Ìý | (1,321 | ) | | State taxes | Ìý | Ìý | 397 | Ìý | Ìý | Ìý | 205 | Ìý | Ìý | Ìý | 257 | Ìý | Effect of change in statutory tax rate (1)
| Ìý | Ìý | 4,519 | Ìý | Ìý | Ìý | — | Ìý | Ìý | Ìý | — | Ìý | | Other, net | Ìý | Ìý | 10 | Ìý | Ìý | Ìý | (29 | ) | Ìý | Ìý | (41 | ) | | Ìý | Ìý | $ | 43,499 | Ìý | Ìý | $ | 17,847 | Ìý | Ìý | $ | 25,244 | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | The effect of the anticipated change in statutory income tax rate from 35% to 21% effective January 1, 2018.
| Ìý The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at December 31,
201
7 and 2016 are as follows (in thousands):
Ìý | Ìý | Ìý | | Ìý | Ìý | | Ìý | | Deferred revenue | Ìý | $ | 8,902 | Ìý | Ìý | $ | 4,177 | Ìý | | Basis difference in pension plan liability | Ìý | Ìý | — | Ìý | Ìý | Ìý | (36 | ) | | Total deferred tax assets | Ìý | Ìý | 8,902 | Ìý | Ìý | Ìý | 4,141 | Ìý | | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | | Basis differences in property, plant and equipment | Ìý | Ìý | 1,691 | Ìý | Ìý | Ìý | — | Ìý | | Basis differences in real estate acquired through foreclosure | Ìý | Ìý | 142 | Ìý | Ìý | Ìý | 234 | Ìý | | Basis difference in pension plan liability | Ìý | Ìý | 68 | Ìý | Ìý | Ìý | — | Ìý | | Deferred installment revenue on land sales for tax purposes | Ìý | Ìý | 9 | Ìý | Ìý | Ìý | 32 | Ìý | | Total deferred tax liability | Ìý | Ìý | 1,910 | Ìý | Ìý | Ìý | 266 | Ìý | | Net deferred tax asset | Ìý | $ | 6,992 | Ìý | Ìý | $ | 3,875 | Ìý | Ìý The Trust files a U. S. Federal income tax return. With few exceptions, the Trust is no longer subject to U. S. Federal income tax examination by tax authorities for years before 201
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