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Quarterly results of operations (unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 12 Months Ended
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
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 147,203,000 $ 138,268,000 $ 142,723,000 $ 159,441,000 $ 196,148,000 $ 244,993,000 $ 284,415,000 $ 348,096,000 $ 587,635,000 $ 1,073,652,000 $ 1,739,717,000
Cost of sales 116,590,000 108,984,000 137,442,000 124,884,000 193,242,000 179,231,000 199,532,000 238,970,000 487,900,000 810,975,000 1,180,265,000
Gross profit 30,613,000 29,284,000 5,281,000 34,557,000 2,906,000 65,762,000 84,883,000 109,126,000 99,735,000 262,677,000 559,452,000
Total operating expenses 56,069,000 55,920,000 58,375,000 60,147,000 194,035,000 57,439,000 66,285,000 73,465,000 230,511,000 391,224,000 316,578,000
Earnings from equity investment 617,000 414,000 216,000 577,000 2,543,000 3,870,000 3,840,000 4,571,000 1,824,000 14,824,000 25,164,000
Operating income (loss) (24,839,000) (26,222,000) (52,878,000) (25,013,000) (188,586,000) 12,193,000 22,438,000 40,232,000 (128,952,000) (113,723,000) 268,038,000
Total other expense 341,000 3,594,000 (3,229,000) 8,341,000 3,424,000 4,543,000 11,662,000 971,000 9,047,000 20,600,000 25,516,000
Income (loss) before income taxes (25,180,000) (29,816,000) (49,649,000) (33,354,000) (192,010,000) 7,650,000 10,776,000 39,261,000 (137,999,000) (134,323,000) 242,522,000
Provision for income tax expense (benefit) (12,677,000) (11,821,000) (21,147,000) (10,406,000) (28,387,000) 932,000 1,911,000 10,605,000 (56,051,000) (14,939,000) 68,145,000
Net income (loss) (12,503,000) (17,995,000) (28,502,000) (22,948,000) (163,623,000) 6,718,000 8,865,000 28,656,000 (81,948,000) (119,384,000) 174,377,000
Less: loss attributable to noncontrolling interest 6,000 (6,000) 35,000 (5,000) (4,000) (2,000) (9,000) (16,000) 30,000 (31,000) 12,000
Net income (loss) attributable to common stockholders $ (12,509,000) $ (17,989,000) $ (28,537,000) $ (22,943,000) $ (163,619,000) $ 6,720,000 $ 8,874,000 $ 28,672,000 $ (81,978,000) $ (119,353,000) $ 174,365,000
Weighted average shares outstanding                      
Basic (in shares) 91,923 90,860 90,707 90,477 90,175 90,058 89,767 89,482 91,226 89,908 92,628
Diluted (in shares) 91,923 90,860 90,707 90,477 90,175 91,687 91,884 91,469 91,226 89,908 95,308
Earnings (loss) per share                      
Basic (in dollars per share) $ (0.14) $ (0.20) $ (0.31) $ (0.25) $ (1.81) $ 0.07 $ 0.10 $ 0.32 $ (0.90) $ (1.33) $ 1.88
Diluted (in dollars per share) $ (0.14) $ (0.20) $ (0.31) $ (0.25) $ (1.81) $ 0.07 $ 0.10 $ 0.31 $ (0.90) $ (1.33) $ 1.83
Goodwill and Intangible asset impairment         $ 125,092       $ 0 $ 125,092,000 $ 0