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Stock-Based Compensation - Incentive Stock Options (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Additional disclosures        
Merger Exchange Ratio   1.76    
Legacy Dawson Plan        
Number of Optioned Shares        
Grants (in shares) 0 0 0 0
Exercise of stock options (in shares) 0 0 0 0
Additional disclosures        
Excess tax benefits from disqualifying dispositions $ 0 $ 0 $ 0 $ 0
Total intrinsic value of options exercised       13,000
Unvested stock options        
Number of Optioned Shares        
Balance at the beginning of the period (in shares)   428,430    
Forfeited (in shares)   (22,519)    
Expired (in shares)   (36,447)    
Balance at the end of the period (in shares)   369,464 428,430  
Exercisable at the end of the period (in shares)   369,464    
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share)   $ 13.01    
Forfeited (in dollars per share)   11.05    
Expired (in dollars per share)   17.34    
Balance at the end of the period (in dollars per share)   12.70 $ 13.01  
Exercisable at the end of the period (in dollars per share)   $ 12.70    
Weighted Average Remaining Contractual Term        
Outstanding at the end of the period (in years)   2 years 1 month 2 days    
Exercisable at the end of the period (in years)   2 years 1 month 2 days    
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars)   $ 0    
Additional disclosures        
Tax deductions recorded when options are awarded   0    
Unrecognized compensation expense related to share-based compensation plans   0    
Cash received from share-based payment arrangements $ 0 $ 0 $ 0 $ 32,000