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Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
plan
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 200,000 $ 500,000 $ 400,000 $ 1,400,000  
Number of share-based compensation plans | plan     4    
Number of shares available for grant (in shares) 0   0    
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $     $ 0    
Award expiration term     5 years    
Number of awards outstanding (in shares) 1,200,000   1,200,000   3,800,000
Stock Appreciation Rights (SARs) | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of awards vested     50.00%    
Number of average consecutive trading days required at trigger stock price     30 days    
Minimum stock price required to trigger award vesting (in dollars per share) | $ / shares     $ 8    
Stock Appreciation Rights (SARs) | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of awards vested     50.00%    
Number of average consecutive trading days required at trigger stock price     30 days    
Minimum stock price required to trigger award vesting (in dollars per share) | $ / shares     $ 12    
Stock Incentive Plan 2011          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) 3,231,828   3,231,828