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Stockholders' Equity - Stock-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Share-based compensation expense            
Stock-based compensation expense $ 2,638 $ 7,688 $ 10,749 $ 15,478    
Tax benefit 506 2,655 1,713 5,363    
Accelerated stock award expense, restructuring termination as Type III modification 1,100          
Stock-based compensation cost related to non-vested equity awards not yet recognized as an expense 59,200   $ 59,200      
Weighted-average period over which stock-based compensation cost related to non-vested equity awards is expected to be recognized (in years)     2 years 6 months 15 days      
Employee Stock Purchase Plan            
Share-based compensation expense            
Stock-based compensation expense 67 196 $ 330 450    
Stock options            
Share-based compensation expense            
Stock-based compensation expense 1,535 2,209 2,988 3,968    
Restricted stock awards            
Share-based compensation expense            
Stock-based compensation expense $ 1,036 5,283 $ 7,431 11,060    
Granted (in shares)     1,798      
Non-vested at the beginning of the period (in shares) 2,250   2,250     1,645
Restricted stock awards | 2015 Performance Obligation            
Share-based compensation expense            
Non-vested at the beginning of the period (in shares)         2,251  
Forecasted number of awards with contingent performance conditions 561   561      
Forecasted awards with contingent performance conditions (in dollars per share) $ 23.49   $ 23.49      
Cost of revenues            
Share-based compensation expense            
Stock-based compensation expense $ 471 1,362 $ 2,208 2,916    
Research and development            
Share-based compensation expense            
Stock-based compensation expense 953 2,032 2,980 3,811    
Selling, general and administrative            
Share-based compensation expense            
Stock-based compensation expense $ 1,214 $ 4,294 $ 5,561 $ 8,751