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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
deferred tax effect - tax cut job act benefit | $ (73,028) | $ 0 | $ 0
Difference between the income tax computation by the company and the statutory body |  |  |
Provision at the U.S. federal statutory rate | 76,651 | 79,580 | 63,760
Increase (decrease) resulting from: |  |  |
State income tax, net of benefit for federal deduction | 4,472 | 4,230 | 4,448
Foreign income tax rate differential | (2,443) | (2,799) | (2,002)
Employment credits | (862) | (821) | (407)
Changes in valuation allowances | 629 | 749 | 14,667
Nondeductible Goodwill | 0 | 34 | 4,651
Stock-based compensation | (136) | 368 | 386
Other | 278 | (1,035) | 2,669
Provision for income taxes | $ 5,561 | $ 80,306 | $ 88,172

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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