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Investment in unconsolidated subsidiary (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Current assets	$ 749,716	$ 717,812
Current liabilities	141,845	151,553
Global Tubing LLC
Schedule of Equity Method Investments [Line Items]
Current assets	48,194	56,160
Long-term assets	142,682	145,965
Current liabilities	11,918	10,861
Long-term liabilities	$ 80,500	$ 95,000

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