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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