Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	$ 14,223		$ 6,851
Change in accrued capital expenditures	(1,414)		4,559
Revision to asset retirement obligation	1,223
Interest rate swaps novated from the Fund			2,875
General and administrative expense allocated from the Fund	14,963		13,916
Amortization of increasing rate distributions	$ 7,389	[1]

[1] Amortization of increasing rate distributions is offset in the preferred unitholder’s capital account by a non-cash distribution.