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Stock Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options outstanding (in shares) 1,202,000 1,222,000 1,269,000  
Number of options granted (in shares) 0 0    
Options, intrinsic value, vested $ 0 $ 0    
Options, intrinsic value, unvested 0 0    
Options, intrinsic value, exercised 0 0    
Unrecognized stock-based compensation expense for stock options 0      
Stock-based compensation, tax benefit 0 0    
Compensation costs capitalized as part of the cost of an asset 0 0    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option compensation expense $ 18,000 $ 361,000    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding (in shares) 341,000 363,000 261,000  
Stock option compensation expense $ 58,000 $ 161,000    
Shares withheld and repurchased to satisfy tax obligations (in shares) 3,200      
Tax obligations relating to the vesting of shares $ 1,000      
Stock-based compensation expense in lieu of payment of cash bonus   $ 93,000    
Granted, restricted shares (in shares)   170,000    
Unrecognized stock-based compensation expense for other than options 155,000      
Unrecognized stock-based compensation expense for other than options, to be expenses upon change in control $ 137,000      
Weighted average period for amortization of unrecognized stock-based compensation 8 months      
Time-based Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation expense for other than options $ 18,000      
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding (in shares) 1,752,000 3,196,000 2,164,000  
Stock option compensation expense $ 382,000 $ 407,000    
Granted, restricted shares (in shares)   2,261,000    
Unrecognized stock-based compensation expense for other than options $ 467,000      
Stock-based compensation arrangement, vested in period, remain outstanding (in shares) 988,000      
Time-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding (in shares) 644,000      
Unrecognized stock-based compensation expense for other than options $ 164,000      
Weighted average period for amortization of unrecognized stock-based compensation 4 months      
Performance-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding (in shares) 1,108,000      
Unrecognized stock-based compensation expense for other than options $ 303,000      
2014 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares) 1,368,000     4,400,000
2007 Stock Incentive Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options outstanding (in shares) 1,202,000      
2007 Stock Incentive Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted shares outstanding (in shares) 171,000      
2000 Stock Incentive Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options outstanding (in shares) 500