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 9 Months Ended
Mar. 31, 2015
performance_period
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 28,794 $ 22,111 $ 79,473 $ 60,116
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   $ 1,800 1,900 $ 5,100 4,400
Stock-based compensation expense   $ 600 $ 600 $ 1,900 $ 1,500
Common stock issued (in shares) | shares     149,378 538,398 149,378
Option grants in period | shares   255,432      
Stock options          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 2,300 $ 4,000 $ 7,500 $ 11,200
Restricted stock units          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   25,400 $ 17,500 $ 69,100 $ 47,400
Vesting period       4 years  
Market stock units          
Stock-based Compensation Plans and Awards          
Stock-based compensation expense   $ 500   $ 1,000  
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%