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Investment in unconsolidated subsidiary (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 02, 2013 Global Tubing LLC [Member] | Dec. 31, 2013 Global Tubing LLC [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated subsidiary |  |  |  |  | $ 112,241,000 | $ 0 | $ 0 | $ 112,200,000 |
Distribution from unconsolidated subsidiary |  |  |  |  | 64,228,000 | 0 | 0 | 64,200,000 | 5,900,000
Equity method investment, partner net investment |  |  |  |  |  |  |  | 48,000,000 |
Equity method investment, deferred tax liability |  |  |  |  |  |  |  | 10,900,000 |
Equity method investment, partner gross investment |  |  |  |  |  |  |  | 58,900,000 |
Earnings from equity investment | 4,366,000 | 2,946,000 | 0 | 0 | 7,312,000 | 0 | 0 |  | 7,300,000
Investment in unconsolidated subsidiary | $ 60,292,000 |  |  |  | $ 60,292,000 | $ 0 |  |  | $ 60,300,000

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