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Employee benefit plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Shares (in thousands)    
Outstanding at beginning of period (shares) 13,081  
Granted (shares) 2,516  
Exercised (shares) (1,442)  
Forfeited/Cancelled (shares) (1,115)  
Outstanding at end of period (shares) 13,040 13,081
Weighted- average exercise price    
Outstanding at beginning of period (in dollars per share) $ 11.82  
Granted (usd per share) 11.33  
Exercised (usd per share) 1.53  
Forfeited/Cancelled (usd per share) 19.61  
Outstanding at end of period (in dollars per share) $ 12.20 $ 11.82
Weighted- average remaining contractual term (in years) 6 years 4 months 27 days 6 years 8 months 12 days
Aggregate intrinsic value (in thousands) $ 86,550 $ 108,846
Exercisable (shares) 8,132  
Exercisable - Weighted average exercise price (in dollars per share) $ 9.28  
Exercisable - Weighted-average remaining contractual term 5 years 6 months 2 days  
Exercisable - Aggregate intrinsic value $ 73,387  
Vested and expected to vest (shares) 12,803  
Vested and expected to vest - Weighted average exercise price (in dollars per share) $ 12.12  
Vested and expected to vest - Weighted average remaining contractual term 6 years 4 months 12 days  
Vested and expected to vest - Aggregate intrinsic value $ 85,781