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Earnings (loss) per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net income (loss) $ (43,080) $ (56,112) $ (33,897) $ 73,779 $ 75,829 $ 50,405 $ 20,344 $ (20,104) $ (59,310) $ 126,474 $ (40,313)
Amount allocated to common shareholders (in hundredths)                 100.00% 91.81% 100.00%
Basic EPS:                      
Net income (loss) allocated to common stockholders $ (43,080) $ (56,112) $ (33,897) $ 67,813 $ 69,669 $ 46,277 $ 18,675 $ (20,104)   $ 116,118  
Shares outstanding, basic                   88,823  
Basic (in dollars per share) $ (0.50) $ (0.65) $ (0.39) $ 0.76 $ 0.78 $ 0.52 $ 0.21 $ (0.23) $ (0.68) $ 1.31 $ (0.45)
Basic and Diluted EPS:                      
Net income (loss) allocated to common stockholders                 $ (59,310)   $ (40,313)
Shares outstanding, basic and diluted                 87,375   88,612
Basic and Diluted (in dollars per share)                 $ (0.68)   $ (0.45)
Effect of Dilutive Securities:                      
Share-based compensation plans (shares)                   605  
Diluted EPS:                      
Net income (loss) allocated to common stockholders                   $ 116,118  
Shares outstanding, diluted                   89,428  
Diluted (in dollars per share) $ (0.50) $ (0.65) $ (0.39) $ 0.76 $ 0.78 $ 0.52 $ 0.21 $ (0.23) $ (0.68) $ 1.30 $ (0.45)