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Income Taxes - U.S. Statutory Federal Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of U.S. statutory federal income tax expense to income tax expense |  |  |
U.S. statutory federal tax expense | $ 135,255 | $ 191,310 | $ 254,293
Increase (decrease) in taxes resulting from: |  |  |
State and local income taxes | 6,326 | 5,785 | 11,518
Other permanent items, net | (1,072) | (11,101) | (5,828)
Worthless stock | (15,175) |  |
Noncontrolling interests | (25,582) | (16,117) | (21,873)
Foreign losses, net | (1,055) | 24,288 | 8,640
Valuation allowance, net | 22,860 | 6,978 | 5,611
Statute expirations and tax authority settlements |  | (13,280) | (7,827)
Revaluation due to Section 987 tax law change |  | 24,156 |
Impact of tax reform | 37,423 |  |
International restructuring | (46,295) |  |
Other, net | 9,287 | 7,132 | 1,354
Total income tax expense | $ 121,972 | $ 219,151 | $ 245,888

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the foreign statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible restructuring charges. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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=84230637&loc=d3e32687-109319 Reference 2: 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=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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