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Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
plan
$ / shares
shares
Jun. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $ $ 500,000 $ 1,400,000 $ 1,400,000 $ 3,000,000
Number of share-based compensation plans | plan     4  
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $     $ 0  
Number of awards granted     2,700,000  
Number of awards outstanding 5,100,000   5,100,000  
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 | $ / 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 | $ / shares     $ 12  
Stock Incentive Plan 2011        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant 1,988,854   1,988,854