Quarterly report pursuant to Section 13 or 15(d)

Equity and Share-Based Compensation - Non-Employee Director Restricted Stock Units Containing a Market Condition (Details)

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Equity and Share-Based Compensation - Non-Employee Director Restricted Stock Units Containing a Market Condition (Details) - Performance stock units - Non-employee directors - USD ($)
$ / shares in Units, $ in Millions
Nov. 23, 2016
Sep. 30, 2018
Share-Based Compensation    
Granted (in shares) 76,296  
Trailing average share price period based on common stock (in days) 60 days  
Market Price Hurdle (in dollars per share) $ 30.00  
Calculated fair value per stock option (in dollars per share)   $ 1.36
Unrecognized expense for share-based compensation   $ 0.0
Accrued liabilities    
Share-Based Compensation    
Liability related to market condition awards   $ 0.1