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Income Taxes (Components of Income Before Taxes and of Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes |  |  |
United States | $ 35,050 | $ 21,634 | $ 11,319
Foreign | 961 | 2,312 | 1,456
Income before income taxes | 36,011 | 23,946 | 12,775
Federal |  |  |
Current | (58) | 324 | (208)
Deferred | (31,198) | 8,807 | 4,871
Total | (31,256) | 9,131 | 4,663
State |  |  |
Current | 284 | 14 | 13
Deferred | 4,805 | 292 | 1,163
Total | 5,089 | 306 | 1,176
Foreign |  |  |
Current | 20 | 440 | 476
Total | 20 | 440 | 476
Total |  |  |
Current | 246 | 778 | 281
Deferred | (26,393) | 9,099 | 6,034
Total | (26,147) | 9,877 | 6,315
Reconciliation of the federal income tax expense at the statutory rate to the effective income tax expense |  |  |
Statutory federal income tax expense | 12,244 | 8,142 | 4,343
State taxes, net of federal benefit | 3,360 | 202 | 776
Foreign tax paid | 20 | 440 | 476
Change in federal tax rate | (43,643) |  |
Tax consequences of the sale of engines to WMES | 164 |  | (306)
Uncertain tax positions |  | (40) | (195)
Permanent differences-nondeductible executive compensation | 1,238 | 1,201 | 1,117
Permanent differences and other | 470 | (68) | 104
Total | $ (26,147) | $ 9,877 | $ 6,315
Reconciliation of the federal income tax expense |  |  |
Statutory federal income tax expense (as a percent) | 35.00% |  |

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- Definition Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a)-(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations, which is attributable to permanent differences and other items. + References No definition available. + Details
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- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations attributable to permanent differences from IRS section 162(m). + References No definition available. + Details
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- Definition Represents the portion of the difference between total income tax expense or benefit as reported in the income statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to the pretax income from continuing operations, which is attributable to tax consequences of the sale of equipment. + References No definition available. + Details
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