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Stock Based Compensation (Long-Term Equity Incentive Plans) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2016
performance_metric
Dec. 31, 2015
USD ($)
performance_metric
May 31, 2010
shares
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of performance measures | performance_metric 2 3  
Performance measurement period 3 years    
Long-Term Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Company's common stock authorized to employees (in shares) (up to) | shares     5,300,000
Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Long-Term Equity Incentive Plan | Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of payout level minimum 0.00% 0.00%  
Percentage of payout level maximum 200.00% 150.00%  
Percentage of payout level target 100.00% 100.00%  
Revenues benchmark for performance payout (less than) | $   $ 1,000,000,000  
Non-Employee Director | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
33% in Year One | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%    
33% in Year One | Non-Employee Director | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%    
33% in Year Two | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%    
33% in Year Two | Non-Employee Director | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%    
33% in Year Three | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%    
33% in Year Three | Non-Employee Director | Long-Term Equity Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments 33.33%