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Share-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2014
shares
Dec. 31, 2017
USD ($)
company
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation costs capitalized in period | $   $ 100,000 $ 100,000 $ 0
Tax benefit from compensation expense | $   300,000 500,000 1,500,000
Total compensation cost not yet recognized | $   $ 3,900,000    
Period for recognition   3 years    
Fair value of stock options that vested during period | $   $ 1,600,000 400,000 $ 800,000
Granted (in shares)   1,159,856    
Vested/Paid (in shares)   (39,168)    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share) | $ / shares   $ 1.87   $ 5.08
Period until vesting   1 year    
Granted (in shares)   487,502    
Total value of stock that vested | $   $ 1,300,000 2,400,000 $ 4,700,000
Vested/Paid (in shares)   (78,557)    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Period until vesting   1 year    
Award expiration period   10 years    
Cash settled stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Granted (in shares)   889,587    
Total value of stock that vested | $   $ 100,000 $ 300,000  
Vested/Paid (in shares)   (31,703) (111,461)  
Market Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage   33.33%    
Granted (in shares) 60,767 270,269    
Evaluation period (in days)   20 days    
Number of peer group companies | company   12    
Earned at end of performance period, percent     50.00%  
Vested/Paid (in shares)   (7,465)    
Restricted Stock Units (RSUs) And Market Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred compensation share-based arrangements, liability, current | $   $ 300,000 $ 100,000  
Prior to 2011 | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual vesting percentage   25.00%    
Minimum | Market Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earning percentage   0.00%    
Maximum | Market Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Earning percentage   200.00%