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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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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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