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Condensed consolidating financial statements (Condensed consolidating statements of income and comprehensive income (loss)) (Details) - USD ($) | 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
Condensed Statements of Income and Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 227,008,000 | 264,906,000 | 312,821,000
Goodwill and Intangible asset impairment |  |  |  |  | 125,092 |  |  |  | 0 | 125,092,000 | 0
Other operating expense |  |  |  |  |  |  |  |  |  |  | 3,757,000
Transaction expenses |  |  |  |  |  |  |  |  | 865,000 | 480,000 | 2,326,000
Loss on sale of assets |  |  |  |  |  |  |  |  | 2,638,000 | 746,000 | 1,431,000
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
Equity earnings from affiliate, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
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
Other expense (income) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 27,410,000 | 29,945,000 | 29,847,000
Interest income with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Interest expense with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Foreign exchange (gains) losses and other, net |  |  |  |  |  |  |  |  | (21,341,000) | (9,345,000) | (4,331,000)
Deferred loan costs written off |  |  |  |  |  |  |  |  | 2,978,000 | 0 | 0
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: Income (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
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
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
Change in foreign currency translation, net of tax of $0 |  |  |  |  |  |  |  |  | (45,722,000) | (45,270,000) | (43,694,000)
Gain (loss) on pension liability |  |  |  |  |  |  |  |  | (335,000) | 46,000 | (1,110,000)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (128,005,000) | (164,608,000) | 129,573,000
Less: comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (162,000) | 168,000 | 46,000
Comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (128,167,000) | (164,440,000) | 129,619,000
Reportable Legal Entities | FET (Parent) |  |  |  |  |  |  |  |  |  |  |
Condensed Statements of Income and Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Goodwill and Intangible asset impairment |  |  |  |  |  |  |  |  |  | 0 |
Other operating expense |  |  |  |  |  |  |  |  |  |  | 0
Transaction expenses |  |  |  |  |  |  |  |  | 0 |  |
Loss on sale of assets |  |  |  |  |  |  |  |  | 0 |  |
Total operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings from equity investment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity earnings from affiliate, net of tax |  |  |  |  |  |  |  |  | (62,180,000) | (99,908,000) | 193,724,000
Operating income (loss) |  |  |  |  |  |  |  |  | (62,180,000) | (99,908,000) | 193,724,000
Other expense (income) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 27,480,000 | 29,914,000 | 29,783,000
Interest income with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Interest expense with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Foreign exchange (gains) losses and other, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deferred loan costs written off |  |  |  |  |  |  |  |  | 2,978,000 |  |
Total other expense |  |  |  |  |  |  |  |  | 30,458,000 | 29,914,000 | 29,783,000
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (92,638,000) | (129,822,000) | 163,941,000
Provision for income tax expense (benefit) |  |  |  |  |  |  |  |  | (10,660,000) | (10,469,000) | (10,424,000)
Net income (loss) |  |  |  |  |  |  |  |  | (81,978,000) | (119,353,000) | 174,365,000
Less: Income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (81,978,000) | (119,353,000) | 174,365,000
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (81,978,000) | (119,353,000) | 174,365,000
Change in foreign currency translation, net of tax of $0 |  |  |  |  |  |  |  |  | (45,722,000) | (45,270,000) | (43,694,000)
Gain (loss) on pension liability |  |  |  |  |  |  |  |  | (335,000) | 46,000 | (1,110,000)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (128,035,000) | (164,577,000) | 129,561,000
Less: comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (128,035,000) | (164,577,000) | 129,561,000
Reportable Legal Entities | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statements of Income and Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 436,785,000 | 810,890,000 | 1,266,376,000
Cost of sales |  |  |  |  |  |  |  |  | 375,509,000 | 646,076,000 | 887,428,000
Gross profit |  |  |  |  |  |  |  |  | 61,276,000 | 164,814,000 | 378,948,000
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 187,974,000 | 201,904,000 | 244,577,000
Goodwill and Intangible asset impairment |  |  |  |  |  |  |  |  |  | 57,392,000 |
Other operating expense |  |  |  |  |  |  |  |  |  |  | 3,564,000
Transaction expenses |  |  |  |  |  |  |  |  | 825,000 | 480,000 |
Loss on sale of assets |  |  |  |  |  |  |  |  | 2,616,000 | 943,000 |
Total operating expenses |  |  |  |  |  |  |  |  | 191,415,000 | 260,719,000 | 248,141,000
Earnings from equity investment |  |  |  |  |  |  |  |  | 1,824,000 | 14,824,000 | 25,164,000
Equity earnings from affiliate, net of tax |  |  |  |  |  |  |  |  | 14,663,000 | (28,419,000) | 90,067,000
Operating income (loss) |  |  |  |  |  |  |  |  | (113,652,000) | (109,500,000) | 246,038,000
Other expense (income) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (110,000) | 10,000 | 78,000
Interest income with affiliate |  |  |  |  |  |  |  |  |  |  | (5,770,000)
Interest expense with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Foreign exchange (gains) losses and other, net |  |  |  |  |  |  |  |  | (5,264,000) | (479,000) | 116,000
Deferred loan costs written off |  |  |  |  |  |  |  |  | 0 |  |
Total other expense |  |  |  |  |  |  |  |  | (5,374,000) | (469,000) | (5,576,000)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (108,278,000) | (109,031,000) | 251,614,000
Provision for income tax expense (benefit) |  |  |  |  |  |  |  |  | (46,098,000) | (9,123,000) | 57,890,000
Net income (loss) |  |  |  |  |  |  |  |  | (62,180,000) | (99,908,000) | 193,724,000
Less: Income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (62,180,000) | (99,908,000) | 193,724,000
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (62,180,000) | (99,908,000) | 193,724,000
Change in foreign currency translation, net of tax of $0 |  |  |  |  |  |  |  |  | (45,722,000) | (45,270,000) | (43,694,000)
Gain (loss) on pension liability |  |  |  |  |  |  |  |  | (335,000) | 46,000 | (1,110,000)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (108,237,000) | (145,132,000) | 148,920,000
Less: comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (108,237,000) | (145,132,000) | 148,920,000
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statements of Income and Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 198,684,000 | 369,186,000 | 637,205,000
Cost of sales |  |  |  |  |  |  |  |  | 161,190,000 | 269,900,000 | 453,785,000
Gross profit |  |  |  |  |  |  |  |  | 37,494,000 | 99,286,000 | 183,420,000
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 39,034,000 | 63,002,000 | 68,244,000
Goodwill and Intangible asset impairment |  |  |  |  |  |  |  |  |  | 67,700,000 |
Other operating expense |  |  |  |  |  |  |  |  |  |  | 193,000
Transaction expenses |  |  |  |  |  |  |  |  | 40,000 |  |
Loss on sale of assets |  |  |  |  |  |  |  |  | 22,000 | (197,000) |
Total operating expenses |  |  |  |  |  |  |  |  | 39,096,000 | 130,505,000 | 68,437,000
Earnings from equity investment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity earnings from affiliate, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (1,602,000) | (31,219,000) | 114,983,000
Other expense (income) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 40,000 | 21,000 | (14,000)
Interest income with affiliate |  |  |  |  |  |  |  |  |  |  | 0
Interest expense with affiliate |  |  |  |  |  |  |  |  |  |  | 5,770,000
Foreign exchange (gains) losses and other, net |  |  |  |  |  |  |  |  | (16,077,000) | (8,866,000) | (4,447,000)
Deferred loan costs written off |  |  |  |  |  |  |  |  | 0 |  |
Total other expense |  |  |  |  |  |  |  |  | (16,037,000) | (8,845,000) | 1,309,000
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 14,435,000 | (22,374,000) | 113,674,000
Provision for income tax expense (benefit) |  |  |  |  |  |  |  |  | 707,000 | 4,653,000 | 20,679,000
Net income (loss) |  |  |  |  |  |  |  |  | 13,728,000 | (27,027,000) | 92,995,000
Less: Income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 30,000 | (31,000) | 12,000
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 13,698,000 | (26,996,000) | 92,983,000
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 13,728,000 | (27,027,000) | 92,995,000
Change in foreign currency translation, net of tax of $0 |  |  |  |  |  |  |  |  | (45,722,000) | (45,270,000) | (43,694,000)
Gain (loss) on pension liability |  |  |  |  |  |  |  |  | (335,000) | 46,000 | (1,110,000)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (32,329,000) | (72,251,000) | 48,191,000
Less: comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (162,000) | 168,000 | 46,000
Comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (32,491,000) | (72,083,000) | 48,237,000
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Statements of Income and Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (47,834,000) | (106,424,000) | (163,864,000)
Cost of sales |  |  |  |  |  |  |  |  | (48,799,000) | (105,001,000) | (160,948,000)
Gross profit |  |  |  |  |  |  |  |  | 965,000 | (1,423,000) | (2,916,000)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Goodwill and Intangible asset impairment |  |  |  |  |  |  |  |  |  | 0 |
Other operating expense |  |  |  |  |  |  |  |  |  |  | 0
Transaction expenses |  |  |  |  |  |  |  |  | 0 |  |
Loss on sale of assets |  |  |  |  |  |  |  |  | 0 |  |
Total operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings from equity investment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity earnings from affiliate, net of tax |  |  |  |  |  |  |  |  | 47,517,000 | 128,327,000 | (283,791,000)
Operating income (loss) |  |  |  |  |  |  |  |  | 48,482,000 | 126,904,000 | (286,707,000)
Other expense (income) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income with affiliate |  |  |  |  |  |  |  |  |  |  | 5,770,000
Interest expense with affiliate |  |  |  |  |  |  |  |  |  |  | (5,770,000)
Foreign exchange (gains) losses and other, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deferred loan costs written off |  |  |  |  |  |  |  |  | 0 |  |
Total other expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 48,482,000 | 126,904,000 | (286,707,000)
Provision for income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 48,482,000 | 126,904,000 | (286,707,000)
Less: Income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 48,482,000 | 126,904,000 | (286,707,000)
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 48,482,000 | 126,904,000 | (286,707,000)
Change in foreign currency translation, net of tax of $0 |  |  |  |  |  |  |  |  | 91,444,000 | 90,540,000 | 87,388,000
Gain (loss) on pension liability |  |  |  |  |  |  |  |  | 670,000 | (92,000) | 2,220,000
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 140,596,000 | 217,352,000 | (197,099,000)
Less: comprehensive loss (income) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | $ 140,596,000 | $ 217,352,000 | $ (197,099,000)

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