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Employee benefit plans - Restricted Stock Units Activity (Details) - RSUs [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares (in thousands)  
Non-vested shares at beginning of period (shares) | shares 7,217
Granted (shares) | shares 4,157
Vested (shares) | shares (1,855)
Forfeited (shares) | shares (402)
Non-vested shares at end of period (shares) | shares 9,117
Weighted-average grant date fair value  
Non-vested shares at beginning of period (in dollars per share) | $ / shares $ 8.15
Weighted average price of shares granted (usd per share) | $ / shares 6.39
Weighted average price of shares vested (usd per share) | $ / shares 9.00
Weighted average price of shares forfeited (usd per share) | $ / shares 8.12
Non-vested shares at end of period (in dollars per share) | $ / shares $ 7.18