XML 93 R71.htm IDEA: XBRL DOCUMENT v3.6.0.2
Employee plans - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 469
Granted (in shares) | shares 1,306
Vested (in shares) | shares (187)
Forfeited and expired (in shares) | shares (134)
Outstanding at end of period (in shares) | shares 1,454
Weighted-Average Grant-Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 23.57
Granted (in dollars per share) | $ / shares 9.91
Vested (in dollars per share) | $ / shares 18.94
Forfeited and expired (in dollars per share) | $ / shares 15.50
Outstanding at end of period (in dollars per share) | $ / shares $ 12.68