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Earnings (loss) per share - Antidilutive securities excluded from the calculation of diluted EPS (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from calculation of diluted EPS 105,453 356,634 320,553
Service-Based Share Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from calculation of diluted EPS 840,402 608,914 0