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Income Taxes - Schedule of Difference in Income Taxes from Amounts Computed by Applying Federal Statutory Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Provision for federal income taxes at the statutory rate $ (42,240) $ (35,986) $ (30,473)
(Increases)/decreases in tax resulting from:      
Provision for state income taxes, net of federal income tax benefits (6,692) (4,210) (4,063)
Rate adjustment - new tax reform legislation (23,126) 0 0
Change in valuation allowance 0 0 1,626
Domestic production activities deduction 2,868 2,481 2,087
Nondeductible items-other (94) (58) (52)
Non-controlling interests 3,366 2,895 1,024
Change in RBIL estimate 0 0 1,771
Tax credits (160) 166 1,272
Stock based compensation 281 27 0
Other, net 2,864 (165) 2
(Provision) benefit from income taxes $ (62,933) $ (34,850) $ (26,806)