Series A Convertible Redeemable Preferred Units (Beginning And Ending Balances Of The Series A Preferred Units) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012		Sep. 02, 2009
Temporary Equity Disclosure [Abstract]
Beginning balance Series A Preferred Units, shares	4,371,586		4,371,586
Accretion of Series A Preferred Units, shares	0
Ending balance Series A Preferred Units, shares	4,371,586		4,371,586
Beginning balance Series A Preferred Units	$ 71,144,000
Accretion of Series A Preferred Units	1,226,000
Ending balance Series A Preferred Units	72,370,000	[1]
Mandatorily redeemable all accrued but unpaid distributions	$ 80,000,000
Preferred Stock, Redemption Date	Sep. 02, 2029

[1] *This amount will be accreted to $80 million plus any accrued but unpaid distributions and interest by deducting amounts from partners’ capital over the remaining periods until the mandatory redemption date of September 2, 2029.