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Income tax expense (benefit) (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 74,272 | $ 81,989 | $ 85,897
State | 16,192 | 13,190 | 10,093
Foreign | 0 | 2 | 30
Current income taxes | 90,464 | 95,181 | 96,020
Deferred: |  |  |
Federal | (24,497) | (2,102) | (19,632)
State | (864) | 1,184 | (5,304)
Investment tax credit - net | (62) | (1,131) | (420)
Deferred income taxes | (25,423) | (2,049) | (25,356)
Total income tax expense | $ 65,041 | $ 93,132 | $ 70,664

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from 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)) -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 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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