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Net income (loss) per share - Antidilutive Securities Excluded from Computation of Net Income per Share (Details) - shares
shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2013
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (shares) 22,693 2,373 20,803 1,995