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Stock-Based Compensation - 2015 SAR Award Narrative (Details) - SARs - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2015
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award (in shares)     5,000 106,800 60,000 0
Forfeited (in shares)     67,130 195,490 0 0
2015 SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award (in shares) 60,000          
Exercise price (in dollars per share) $ 24.41          
Contractual term 10 years          
Resulting fair value per share (in dollars per share) $ 12.96          
Forfeited (in shares)   60,000        
Previously recognized expensed now reversed   $ 0.2        
2015 SARs | Selling, General and Administrative Expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense       $ 0.1