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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Difference between the income tax computation by the company and the statutory body |  |  |
Provision at the U.S. federal statutory rate | $ 79,580 | $ 63,760 | $ 57,540
Increase (decrease) resulting from: |  |  |
State income tax, net of benefit for federal deduction | 4,230 | 4,448 | 5,267
Foreign income tax rate differential | (2,799) | (2,002) | (3,188)
Employment credits | (821) | (407) | (481)
Changes in valuation allowances | 749 | 14,667 | 9,507
Nondeductible Goodwill | 34 | 4,651 | 0
Income Tax Reconciliation Goodwill created from Restructuring | 0 | 0 | (10,209)
Stock-based compensation | 368 | 386 | 245
Income tax reconciliation convertible debt redemption | 0 | 0 | 9,727
Other | (1,035) | 2,669 | 2,988
Provision for income taxes | $ 80,306 | $ 88,172 | $ 71,396

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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=6907707&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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