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Share-based compensation (Summary of Plan Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Option | 2011 Equity Incentive Plan      
Restricted Stock Unit Activity [Roll Forward]      
Number of units outstanding, beginning balance (in shares) 634,489 776,475 2,025,894
Forfeited, (in shares)     (80,734)
Expired (in shares) (143,416) (141,986) (51,305)
Modification (in shares)     1,117,380
Number of units outstanding, ending balance (in shares) 491,073 634,489 776,475
Number of units exercisable, ending balance (in shares) 455,719    
Weighted-average strike price      
Outstanding, Weighted-average grant-date fair value, beginning balance (in dollars per share) $ 14.28 $ 15.55 $ 21.03
Forfeitures, Weighted-average grant-date fair value, (in dollars per share)     10.30
Expired, Weighted-average grant-date fair value (in dollars per share) 21.20 21.20 14.05
Modification, Weighted-average grant-date fair value (in dollars per share)     19.07
Outstanding, Weighted-average grant-date fair value, ending balance (in dollars per share) 12.26 14.28 15.55
Exercisable, Weighted-average grant-date fair value (in dollars per share) 12.55    
Weighted-average grant-date fair value      
Outstanding at beginning of period, Weighted-average grant date fair value, (in dollars per share) 4.28 4.46 5.87
Forfeitures, Weighted-average fair value (in dollars per share)     2.68
Expired, Weighted-average grant date fair value, (in dollars per share) 5.89 5.28 4.02
Modification, Weighted-average grant date fair value (in dollars per share)     5.30
Outstanding at end of period, Weighted-average grant date fair value, (in dollars per share) 3.81 $ 4.28 $ 4.46
Exercisable, Weighted-average grant date fair value, (in dollars per share) $ 3.95    
Restricted Share Units | 2011 Equity Incentive Plan      
Restricted Stock Unit Activity [Roll Forward]      
Number of units outstanding, beginning balance (in shares) 1,736,845 1,780,997 1,230,210
Annual grant (in shares) 520,393 497,960 865,291
Vested, (in shares)     (172,328)
Forfeited, (in shares) (117,600) (180,828) (142,176)
Number of units outstanding, ending balance (in shares) 1,605,049 1,736,845 1,780,997
Number of units exercisable, ending balance (in shares) 0    
Weighted-average strike price      
Outstanding, Weighted-average grant-date fair value, beginning balance (in dollars per share) $ 6.65 $ 6.07 $ 7.96
Annual grant, Weighted-average grant-date fair value (in dollars per share) 8.50 9.20 4.70
Vested, Weighted-average grant-date fair value (in dollars per share)     12.25
Forfeitures, Weighted-average grant-date fair value, (in dollars per share) 7.24 5.99 6.64
Outstanding, Weighted-average grant-date fair value, ending balance (in dollars per share) 7.41 $ 6.65 $ 6.07
Exercisable, Weighted-average grant-date fair value (in dollars per share) $ 0.00    
Restricted Share Units | 2012 Equity Incentive Plan      
Restricted Stock Unit Activity [Roll Forward]      
Vested, (in shares) (534,589) (361,284)  
Weighted-average strike price      
Vested, Weighted-average grant-date fair value (in dollars per share) $ 6.01 $ 7.65