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Income Taxes (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of provision for (benefit from) income taxes in effective tax rates |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes at U.S. federal statutory rate of 35% |  |  |  |  |  |  |  |  |  |  | $ (37,165) | $ (15,813) | $ (7,311)
Net state income taxes |  |  |  |  |  |  |  |  |  |  | 2,383 | (5,253) | 937
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (2,904) | (11,166) | (12,685)
Unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | 698 | 4,063 | 416
Valuation allowances and write off of tax attributes |  |  |  |  |  |  |  |  |  |  | 88,088 | 0 | 0
Other |  |  |  |  |  |  |  |  |  |  | 2,089 | 103 | 803
Provision for (benefit from) income taxes | $ 2,367 | $ (1,529) | $ (740) | $ (12,074) | $ (8,289) | $ (17,003) | $ (2,269) | $ (25,292) | $ 98 | $ (37,366) | $ 53,189 | $ (28,066) | $ (17,840)
Effective income tax rate (as a percent) |  |  |  |  |  |  |  |  |  |  | (50.10%) | 62.10% | 85.40%
U.S. federal statutory rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%

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