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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  | 35.00% |  |
United States |  | $ 115,850 | $ 235,256 | $ 281,579
International |  | 578,438 | 480,141 | 410,604
Income before income taxes |  | 694,288 | 715,397 | 692,183
Provision at statutory tax rate |  | 243,001 | 250,389 | 242,264
State taxes, net of federal benefit |  | 5,184 | 9,219 | 10,526
International effective tax rate differential |  | (88,444) | (64,002) | (56,132)
Change in valuation allowance |  | 1,408 | 7,174 | (205)
Other non-deductible expenses |  | 12,700 | 3,516 | 3,530
Changes in tax accruals |  | (7,973) | (3,679) | (7,423)
Tax Credits |  | (8,170) | (14,510) | 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | [1] | (71,261) |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | [2] | 196,010 | 0 | 0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount |  |  | 0 | 0
Other |  | 4,671 | 2,567 | (863)
Provision for income taxes |  | $ 287,126 | $ 190,674 | $ 191,697
[1] | For the year ended December 31, 2017, the company accrued $71,261 in provisional tax benefit related to the net change in deferred tax liabilities stemming from the Tax Act’s reduction of the U.S. federal tax rate from 35% to 21%, and disallowance of certain incentive based compensation tax deductibility under Internal Revenue Code Section 162(m).
[2] | For the year ended December 31, 2017, the company accrued a reasonable estimate of $196,010 of tax expense for the Tax Act’s one-time transition tax on the foreign subsidiaries’ accumulated, unremitted earnings going back to 1986

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 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) -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 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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