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Condensed consolidating financial statements (Condensed consolidating balance sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 131,977 | $ 109,249 | $ 83,891 | $ 76,579
Accounts receivable—trade, net | 109,203 | 138,597 |  |
Inventories | 416,105 | 424,121 |  |
Costs and estimated profits in excess of billings | 14,124 | 12,009 |  |
Other current assets | 26,846 | 33,836 |  |
Total current assets | 698,255 | 717,812 |  |
Property and equipment, net of accumulated depreciation | 180,206 | 186,667 |  |
Deferred financing costs, net | 1,750 | 4,125 |  |
Deferred income taxes, net | 779 | 780 |  |
Intangible assets | 240,967 | 246,650 |  |
Goodwill | 671,190 | 669,036 |  |
Investment in unconsolidated subsidiary | 58,296 | 57,719 |  |
Investment in affiliates | 0 | 0 |  |
Long-term advances to affiliates | 0 | 0 |  |
Other long-term assets | 3,126 | 3,253 |  |
Total assets | 1,854,569 | 1,886,042 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 82 | 253 |  |
Accounts payable—trade | 75,568 | 76,823 |  |
Accrued liabilities | 55,934 | 58,563 |  |
Deferred revenue | 9,119 | 7,283 |  |
Billings in excess of costs and profits recognized | 4,002 | 8,631 |  |
Total current liabilities | 144,705 | 151,553 |  |
Long-term debt, net of current portion | 396,170 | 396,016 |  |
Long-term payables to affiliates | 0 | 0 |  |
Deferred income taxes, net | 40,266 | 51,100 |  |
Other long-term liabilities | 31,464 | 29,956 |  |
Total liabilities | 612,605 | 628,625 |  |
Total stockholders’ equity | 1,241,474 | 1,257,020 |  |
Noncontrolling interest in subsidiary | 490 | 397 |  |
Total equity | 1,241,964 | 1,257,417 |  |
Total liabilities and equity | 1,854,569 | 1,886,042 |  |
Reportable Legal Entities | FET Inc. (Parent) |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 97 | 5,551
Accounts receivable—trade, net | 0 | 0 |  |
Inventories | 0 | 0 |  |
Costs and estimated profits in excess of billings | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property and equipment, net of accumulated depreciation | 0 | 0 |  |
Deferred financing costs, net | 1,750 | 4,125 |  |
Deferred income taxes, net | 0 | 0 |  |
Intangible assets | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Investment in unconsolidated subsidiary | 0 | 0 |  |
Investment in affiliates | 1,175,421 | 1,188,707 |  |
Long-term advances to affiliates | 473,592 | 467,184 |  |
Other long-term assets | 0 | 0 |  |
Total assets | 1,650,763 | 1,660,016 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 0 | 0 |  |
Accounts payable—trade | 0 | 0 |  |
Accrued liabilities | 13,145 | 7,027 |  |
Deferred revenue | 0 | 0 |  |
Billings in excess of costs and profits recognized | 0 | 0 |  |
Total current liabilities | 13,145 | 7,027 |  |
Long-term debt, net of current portion | 396,144 | 395,970 |  |
Long-term payables to affiliates | 0 | 0 |  |
Deferred income taxes, net | 0 | 0 |  |
Other long-term liabilities | 0 | 0 |  |
Total liabilities | 409,289 | 402,997 |  |
Total stockholders’ equity | 1,241,474 | 1,257,019 |  |
Noncontrolling interest in subsidiary | 0 | 0 |  |
Total equity | 1,241,474 | 1,257,019 |  |
Total liabilities and equity | 1,650,763 | 1,660,016 |  |
Reportable Legal Entities | Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 40,746 | 36,884 | 24,223 | 4,006
Accounts receivable—trade, net | 71,748 | 85,537 |  |
Inventories | 320,110 | 318,360 |  |
Costs and estimated profits in excess of billings | 4,458 | 6,477 |  |
Other current assets | 20,480 | 25,447 |  |
Total current assets | 457,542 | 472,705 |  |
Property and equipment, net of accumulated depreciation | 149,830 | 153,995 |  |
Deferred financing costs, net | 0 | 0 |  |
Deferred income taxes, net | (1) | 0 |  |
Intangible assets | 181,081 | 186,234 |  |
Goodwill | 481,374 | 481,374 |  |
Investment in unconsolidated subsidiary | 58,296 | 57,719 |  |
Investment in affiliates | 517,135 | 514,893 |  |
Long-term advances to affiliates | 0 | 0 |  |
Other long-term assets | 2,389 | 2,549 |  |
Total assets | 1,847,646 | 1,869,469 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 71 | 243 |  |
Accounts payable—trade | 59,272 | 57,529 |  |
Accrued liabilities | 34,388 | 40,874 |  |
Deferred revenue | 2,551 | 1,334 |  |
Billings in excess of costs and profits recognized | 632 | 1,872 |  |
Total current liabilities | 96,914 | 101,852 |  |
Long-term debt, net of current portion | 15 | 34 |  |
Long-term payables to affiliates | 533,623 | 527,406 |  |
Deferred income taxes, net | 25,542 | 36,937 |  |
Other long-term liabilities | 16,131 | 14,533 |  |
Total liabilities | 672,225 | 680,762 |  |
Total stockholders’ equity | 1,175,421 | 1,188,707 |  |
Noncontrolling interest in subsidiary | 0 | 0 |  |
Total equity | 1,175,421 | 1,188,707 |  |
Total liabilities and equity | 1,847,646 | 1,869,469 |  |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 91,231 | 72,365 | 59,571 | 67,022
Accounts receivable—trade, net | 37,455 | 53,060 |  |
Inventories | 106,044 | 115,165 |  |
Costs and estimated profits in excess of billings | 9,666 | 5,532 |  |
Other current assets | 6,366 | 8,389 |  |
Total current assets | 250,762 | 254,511 |  |
Property and equipment, net of accumulated depreciation | 30,376 | 32,672 |  |
Deferred financing costs, net | 0 | 0 |  |
Deferred income taxes, net | 780 | 780 |  |
Intangible assets | 59,886 | 60,416 |  |
Goodwill | 189,816 | 187,662 |  |
Investment in unconsolidated subsidiary | 0 | 0 |  |
Investment in affiliates | 0 | 0 |  |
Long-term advances to affiliates | 60,031 | 60,221 |  |
Other long-term assets | 737 | 704 |  |
Total assets | 592,388 | 596,966 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 11 | 10 |  |
Accounts payable—trade | 16,296 | 19,294 |  |
Accrued liabilities | 8,401 | 10,662 |  |
Deferred revenue | 6,568 | 5,949 |  |
Billings in excess of costs and profits recognized | 3,370 | 6,759 |  |
Total current liabilities | 34,646 | 42,674 |  |
Long-term debt, net of current portion | 11 | 12 |  |
Long-term payables to affiliates | 0 | 0 |  |
Deferred income taxes, net | 14,724 | 14,163 |  |
Other long-term liabilities | 15,333 | 15,423 |  |
Total liabilities | 64,714 | 72,272 |  |
Total stockholders’ equity | 527,184 | 524,297 |  |
Noncontrolling interest in subsidiary | 490 | 397 |  |
Total equity | 527,674 | 524,694 |  |
Total liabilities and equity | 592,388 | 596,966 |  |
Eliminations |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable—trade, net | 0 | 0 |  |
Inventories | (10,049) | (9,404) |  |
Costs and estimated profits in excess of billings | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | (10,049) | (9,404) |  |
Property and equipment, net of accumulated depreciation | 0 | 0 |  |
Deferred financing costs, net | 0 | 0 |  |
Deferred income taxes, net | 0 | 0 |  |
Intangible assets | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Investment in unconsolidated subsidiary | 0 | 0 |  |
Investment in affiliates | (1,692,556) | (1,703,600) |  |
Long-term advances to affiliates | (533,623) | (527,405) |  |
Other long-term assets | 0 | 0 |  |
Total assets | (2,236,228) | (2,240,409) |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 0 | 0 |  |
Accounts payable—trade | 0 | 0 |  |
Accrued liabilities | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Billings in excess of costs and profits recognized | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Long-term debt, net of current portion | 0 | 0 |  |
Long-term payables to affiliates | (533,623) | (527,406) |  |
Deferred income taxes, net | 0 | 0 |  |
Other long-term liabilities | 0 | 0 |  |
Total liabilities | (533,623) | (527,406) |  |
Total stockholders’ equity | (1,702,605) | (1,713,003) |  |
Noncontrolling interest in subsidiary | 0 | 0 |  |
Total equity | (1,702,605) | (1,713,003) |  |
Total liabilities and equity | $ (2,236,228) | $ (2,240,409) |  |

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