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Obligations under capital lease (Net Assets Under Capital lease Table) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Compressor equipment	$ 37,199	$ 37,199
Less: Accumulated amortization	(13,813)	(10,361)
Net assets under capital leases	$ 23,386	$ 26,838
Capital Lease Min Term	9 years
Capital Lease Max	10 years

Property, plant, or equipment held under lease agreements classified as an asset.

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.