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Income Taxes - Federal Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate |  |  |  |  |  |  |  |  |  |  |  |
Tax at federal statutory rate |  |  |  |  |  |  |  |  |  | $ 43,500 | $ 150,300 | $ 43,900
State income tax, net of federal benefit |  |  |  |  |  |  |  |  |  | 17,800 | 24,300 | 5,600
Valuation allowance |  |  |  |  |  |  |  |  |  | 58,700 | (51,200) | (54,800)
Impairment, nondeductible for tax |  |  |  |  |  |  |  |  |  | 33,900 |  |
Foreign residual income |  |  |  |  |  |  |  |  |  | 10,300 |  | 17,800
Foreign residual income |  |  |  |  |  |  |  |  |  |  | (9,200) |
Nondeductible costs |  |  |  |  |  |  |  |  |  | 3,500 | 5,800 | 6,100
Change in tax rates |  |  |  |  |  |  |  |  |  | 100 |  | 34,600
Impact of changes in tax law |  |  |  |  |  |  |  |  |  | (47,800) |  |
Income tax credits and incentives |  |  |  |  |  |  |  |  |  | (37,200) | (56,800) | (24,600)
Change in uncertain tax positions |  |  |  |  |  |  |  |  |  | (31,400) | 9,500 | (5,000)
Audit settlement |  |  |  |  |  |  |  |  |  | (27,700) |  |
Return to provision, primarily foreign tax credits |  |  |  |  |  |  |  |  |  | (18,500) |  |
Exclusion of tax on non-controlling interests |  |  |  |  |  |  |  |  |  | (14,900) | (28,200) | (24,700)
Tax exempt income |  |  |  |  |  |  |  |  |  | (7,400) | (17,900) | (17,600)
Foreign tax rate differential |  |  |  |  |  |  |  |  |  | (1,600) | (19,200) | (19,700)
Other items, net |  |  |  |  |  |  |  |  |  | (900) | 300 | 500
Total income tax (benefit) expense | $ 18,700 | $ 33,100 | $ (24,400) | $ (47,100) | $ 6,200 | $ 12,100 | $ (35,400) | $ 24,800 |  | $ (19,643) | $ 7,706 | $ (37,917)
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate (as a percent) |  |  |  | 35.00% |  |  |  |  | 21.00% | 24.50% | 35.00% | 35.00%
State income tax, net of federal benefit (as a percent) |  |  |  |  |  |  |  |  |  | 10.00% | 5.70% | 4.50%
Valuation allowance (as a percent) |  |  |  |  |  |  |  |  |  | 33.10% | (11.90%) | (43.60%)
Impairment, nondeductible for tax (as a percent) |  |  |  |  |  |  |  |  |  | 19.10% |  |
Foreign residual income (as a percent) |  |  |  |  |  |  |  |  |  | 5.80% |  | 14.20%
Foreign residual income (as a percent) |  |  |  |  |  |  |  |  |  |  | (2.10%) |
Nondeductible costs (as a percent) |  |  |  |  |  |  |  |  |  | 1.90% | 1.40% | 4.80%
Change in tax rates (as a percent) |  |  |  |  |  |  |  |  |  | 0.10% |  | 27.60%
Impact of changes in tax law (as a percent) |  |  |  |  |  |  |  |  |  | (26.90%) |  |
Income tax credits and incentive (as a percent) |  |  |  |  |  |  |  |  |  | (21.00%) | (13.20%) | (19.60%)
Change in uncertain tax positions (as a percent) |  |  |  |  |  |  |  |  |  | (17.70%) | 2.20% | (4.00%)
Audit settlement (as a percent) |  |  |  |  |  |  |  |  |  | (15.60%) |  |
Return to provision, primarily foreign tax credits (as a percent) |  |  |  |  |  |  |  |  |  | (10.40%) |  |
Exclusion of tax on non-controlling interests (as a percent) |  |  |  |  |  |  |  |  |  | (8.40%) | (6.60%) | (19.70%)
Tax exempt income (as a percent) |  |  |  |  |  |  |  |  |  | (4.20%) | (4.20%) | (14.00%)
Foreign tax rate differential (as a percent) |  |  |  |  |  |  |  |  |  | (0.90%) | (4.50%) | (15.70%)
Other items, net (as a percent) |  |  |  |  |  |  |  |  |  | (0.50%) |  | 0.30%
Total income tax expense (as a percent) |  |  |  |  |  |  |  |  |  | (11.10%) | 1.80% | (30.20%)

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