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Income Taxes - Narrative (Details) - Successor - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Income Taxes    
Income tax benefit $ 8,457 $ 8,496
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 | Earliest Tax Year    
Income Taxes    
Open tax year   2014
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   2013