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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%)