Series A Preferred Units (Beginning And Ending Balances Of The Series A Preferred Units) (Details) (USD $)	0 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	May 25, 2010	May 25, 2010	Dec. 31, 2010	Dec. 31, 2011		May 24, 2010	Sep. 02, 2009
Temporary Equity Disclosure [Abstract]
Beginning balance, shares		4,371,586	4,371,586	4,371,586		4,371,586
Beginning balance, values		$ 51,711,000	$ 70,793,000	$ 70,943,000		$ 51,766,000
Accretion to redemption, shares		0	0	0
Accretion to redemption, value		55,000	150,000	201,000
Fair value adjustment, shares	0
Fair value adjustment, value	19,027,000
Ending balance as of September 30, 2011, shares	4,371,586	4,371,586	4,371,586	4,371,586	[1]	4,371,586
Ending balance as of September 30, 2011, values	70,793,000	70,793,000	70,943,000	71,144,000	[1]	51,766,000
Mandatory redemption date				Sep. 02, 2029
Deducting amounts from partners' capital over the remaining years				80,000,000
Initial fair value of preferred stock upon issuance							76,600,000
Embedded Derivative, Fair Value of Embedded Derivative Liability							$ 28,900,000

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