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Investment in unconsolidated subsidiary (Income Statement) (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 22, 2017 | 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
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 147,203 | $ 138,268 | $ 142,723 | $ 159,441 | $ 196,148 | $ 244,993 | $ 284,415 | $ 348,096 | $ 587,635 | $ 1,073,652 | $ 1,739,717
Gross profit |  | 30,613 | 29,284 | 5,281 | 34,557 | 2,906 | 65,762 | 84,883 | 109,126 | 99,735 | 262,677 | 559,452
Net income (loss) |  | (12,503) | (17,995) | (28,502) | (22,948) | (163,623) | 6,718 | 8,865 | 28,656 | (81,948) | (119,384) | 174,377
The Company's earnings from equity investment |  | $ 617 | $ 414 | $ 216 | $ 577 | $ 2,543 | $ 3,870 | $ 3,840 | $ 4,571 | 1,824 | 14,824 | $ 25,164
Global Tubing LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 71,473 | 103,532 |
Gross profit |  |  |  |  |  |  |  |  |  | 16,899 | 45,333 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 3,795 | 30,888 |
The Company's earnings from equity investment |  |  |  |  |  |  |  |  |  | $ 1,824 | $ 14,824 |
Subsequent Event | Global Tubing LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional contribution to investment in subsidiary | $ 1,000 |  |  |  |  |  |  |  |  |  |  |

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