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Income Taxes - Effective Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income (loss) from continuing and discontinued operations before income taxes $ (554,956) $ (163,012) $ 295,508
Pre-tax income attributable to pass-through subsidiaries 312,939 (89,104) (306,644)
Pre-tax loss attributable to taxable subsidiaries (242,017) (252,116) (11,136)
Federal tax benefit at statutory tax rate (35%) 50,824 88,241 3,365
State and local income taxes, net of federal income tax benefit 10,983 9,380 88
Foreign income tax differential (3,533) 6 (5,441)
Nondeductible expenses (4,648) (20,372) (1,128)
Excess inclusion income tax expense 0 0 (1,311)
Valuation allowance, net 2,874 (3,555) (692)
Impact of Tax Cuts and Jobs Act 2,190 24,908 0
Other 1,091 (209) 337
Income tax benefit (expense) $ 59,781 $ 98,399 $ (4,782)