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Earnings (loss) per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                        
Net income (loss) $ (15,139) $ (168,464) $ (58,273) $ (9,515) $ (16,163) $ (43,080) $ (56,112) $ (33,897) $ 73,779 $ (252,415) $ (59,310) $ 126,474
Amount allocated to common shareholders (in hundredths) 100.00%       100.00%         100.00% 100.00% 91.81%
Basic and Diluted EPS:                        
Net loss allocated to common stockholders $ (15,139)       $ (16,163)         $ (252,415) $ (59,310)  
Shares outstanding, basic and diluted 87,254       87,040         87,064 87,375  
Basic and Diluted (in dollars per share) $ (0.17)       $ (0.19)         $ (2.90) $ (0.68)  
Basic EPS:                        
Net income (loss) allocated to common stockholders   $ (168,464) $ (58,273) $ (9,515) $ (16,163) $ (43,080) $ (56,112) $ (33,897) $ 67,813     $ 116,116
Shares outstanding, basic                       88,823
Basic (in dollars per share)   $ (1.93) $ (0.67) $ (0.11) $ (0.19) $ (0.50) $ (0.65) $ (0.39) $ 0.76 (2.90) (0.68) $ 1.31
Effect of Dilutive Securities:                        
Share-based compensation plans (shares)                       605
Diluted EPS:                        
Net income (loss) allocated to common stockholders                       $ 116,116
Shares outstanding, diluted                       89,428
Diluted (in dollars per share)   $ (1.93) $ (0.67) $ (0.11) $ (0.19) $ (0.50) $ (0.65) $ (0.39) $ 0.76 $ (2.90) $ (0.68) $ 1.30