Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation Plans and Awards - PSUs Narrative (Details)

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Stock-based Compensation Plans and Awards - PSUs Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2016
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Stock-based Compensation Plans and Awards              
Stock-based compensation expense     $ 32,432,000 $ 27,484,000 $ 71,087,000 $ 50,679,000  
Performance awards              
Stock-based Compensation Plans and Awards              
Requisite service period 4 years            
Total stockholder return, duration period 90 days            
Grants in period (in shares)     1,725,000 0 1,725,000 0  
Grant-date fair value     $ 8,700,000   $ 8,700,000    
Stock-based compensation expense     $ 1,100,000 $ 0 $ 1,100,000 $ 0  
Performance awards | Minimum              
Stock-based Compensation Plans and Awards              
90 Day trailing stock price to vest (usd per share) $ 20.00            
Performance awards | One-Year Performance Period              
Stock-based Compensation Plans and Awards              
Vesting percent 25.00%            
Market Stock Units (MSUs)              
Stock-based Compensation Plans and Awards              
Requisite service period   3 years          
Total stockholder return, duration period   90 days          
Grants in period (in shares)     0   0 776,000  
Grant-date fair value           $ 4,300,000  
Stock-based compensation expense     $ 200,000 $ 500,000 $ 400,000 $ 600,000  
Market Stock Units (MSUs) | One-Year Performance Period              
Stock-based Compensation Plans and Awards              
Vesting percent   33.33%         22.00%