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Earnings (loss) per share - Antidilutive (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Potentially anti-dilutive shares (shares) 94 157 132 157