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Earnings (loss) per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net loss $ (15,139) $ (16,163)
Amount allocated to common stockholders (in hundredths) 100.00% 100.00%
Basic EPS:    
Net loss allocated to common stockholders $ (15,139) $ (16,163)
Net loss allocated to common stockholders (shares) 87,254,000 87,040,000
Net loss allocated to common stockholders (in dollars per share) $ (0.17) $ (0.19)
Stock options [Member]    
Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation of diluted EPS (shares) 207,716 393,237
Service-based share awards [Member]    
Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation of diluted EPS (shares) 1,037,320 498,809