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Quarterly information (Unaudited) - Financial Results by Quarter (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Data [Abstract]                      
Net sales $ 383,915 $ 454,540 $ 523,491 $ 587,911 $ 551,239 $ 500,632 $ 458,324 $ 420,847 $ 1,949,857 $ 1,931,042 $ 1,454,313
Gross profit (loss) (18,701) (42,423) 8,342 94,095 89,339 75,714 38,504 (1,758) 41,313 201,799 39,523
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)
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  
Basic earnings (loss) per share (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)
Diluted earnings (loss) per share (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)