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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2010
Income Taxes |  |  |
Unrecognized tax benefits | $ 0.1 | $ 0.1 |
Minimum |  |  |
Income Taxes |  |  |
Number of tax years open for state tax audit (in years) | 3 years |  |
Maximum |  |  |
Income Taxes |  |  |
Number of tax years open for state tax audit (in years) | 5 years |  |
Domestic Tax Authority |  |  |
Income Taxes |  |  |
Operating loss carryforwards subject to limitation of use | $ 486.0 |  | $ 929.4
Domestic Tax Authority | Earliest Tax Year |  |  |
Income Taxes |  |  |
Open tax year | 2013 |  |
Net Operating Loss And Other Carryforwards | Earliest Tax Year |  |  |
Income Taxes |  |  |
Open tax year | 2005 |  |
Net Operating Loss And Other Carryforwards | Latest Tax Year |  |  |
Income Taxes |  |  |
Open tax year | 2012 |  |

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