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Stock-Based Compensation - 2012 SAR Award Narrative (Details) - SARs
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Jun. 30, 2014
shares
Jun. 30, 2012
USD ($)
valuation_date
anniversary
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)           5,000 106,800 60,000 0  
Exercised (in shares)           0 0 0 120,000  
Expired (in shares)           6,750 61,291 0 0  
Forfeited (in shares)           67,130 195,490 0 0  
2012 SAR                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       543,872            
Exercise price (in dollars per share) | $ / shares   $ 22.07     $ 22.07          
Number of grant date anniversaries | anniversary       3            
Contractual term       10 years            
Number of valuation dates to trigger SAR shares to be exercisable | valuation_date       7            
Number of consecutive valuation dates needed | valuation_date       10            
Discount rate       15.00%            
Resulting fair value per share (in dollars per share) | $ / shares         $ 3.31          
Aggregate compensation expense | $       $ 1.8            
Period until market condition will be met       1 year 9 months 11 days            
Unvested shares (in shares)   181,290                
Period for deferred vesting   30 days                
Exercised (in shares)                 120,000 181,291
Vested (in shares)     181,291              
Expired (in shares)         61,291          
Forfeited (in shares)         181,290          
Previously recognized expensed now reversed | $         $ 0.1          
2012 SAR | Selling, General and Administrative Expenses                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Aggregate compensation expense | $               $ 0.2 $ 0.3  
SAR And Bonus Agreement                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Limit of sale of any vested SAR | $ $ 0.8                  
Period without written consent of the compensation committee 6 months                  
Annual bonus | $ $ 0.3                  
Incremental compensation expense (in dollars per share) | $ / shares $ 1.84                  
Incremental compensation expense from modification | $ $ 0.3                  
SAR And Bonus Agreement | Tranche one                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested shares (in shares) 100,000                  
SAR And Bonus Agreement | Tranche two                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested shares (in shares) 81,290