Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-based Compensation Plans and Awards - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2015
performance_period
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 27,484 $ 20,613 $ 50,679 $ 38,005
Employee stock          
Stock-based Compensation Plans and Awards          
Percentage of eligible compensation to purchase common stock through payroll deductions (as a percent)   15.00%   15.00%  
Offering period       6 months  
Contributions from employees withheld   $ 1,700 1,600 $ 3,300 2,500
Stock-based compensation expense   $ 600 $ 600 $ 1,200 $ 900
Common stock issued (in shares) | shares   282,966 0 282,966 0
Stock options          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 2,400 $ 3,700 $ 5,200 $ 7,200
Option grants in period | shares   0 0 0 0
Restricted stock units          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 24,100 $ 16,300 $ 43,700 $ 29,900
Vesting period       4 years  
Market stock units          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 500   $ 600  
Number of performance periods | performance_period 3        
Total stockholder return, duration period 90 days        
Performance multiplier, percentage point decrease 3.00%        
Performance multiplier, percentage point increase 2.00%        
Grants in period | shares   776,000   776,000  
Total grant date fair value   $ 4,300   $ 4,300  
Market stock units | One-Year Performance Period          
Stock-based Compensation Plans and Awards          
Vesting percent 33.33%        
Market stock units | Two-Year Performance Period          
Stock-based Compensation Plans and Awards          
Vesting percent 33.33%        
Market stock units | Maximum | One and Two-Year Performance Period          
Stock-based Compensation Plans and Awards          
Performance multiplier 100.00%        
Market stock units | Maximum | Three-Year Performance Period          
Stock-based Compensation Plans and Awards          
Performance multiplier 200.00%