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Employee benefit plans - Restricted Stock Units Activity (Details) - RSUs [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares (in thousands)  
Non-vested shares at beginning of period (shares) | shares 4,638
Granted (shares) | shares 6,912
Vested (shares) | shares (1,229)
Forfeited (shares) | shares (1,031)
Non-vested shares at end of period (shares) | shares 9,290
Weighted- average grant date fair value  
Non-vested shares at beginning of period (in dollars per share) | $ / shares $ 32.15
Weighted average price of shares granted (usd per share) | $ / shares 12.15
Weighted average price of shares vested (usd per share) | $ / shares 26.23
Weighted average price of shares forfeited (usd per share) | $ / shares 26.10
Non-vested shares at end of period (in dollars per share) | $ / shares $ 18.73