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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