Partners' Capital (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Class B Units [Member]	Mar. 31, 2013 QRE GP [Member]	Mar. 31, 2013 General Partner [Member] QRE GP [Member]	Mar. 31, 2013 Limited Partner [Member] QRE GP [Member]	Mar. 31, 2013 Limited Partner [Member] Fund [Member]	Mar. 31, 2013 Class B Units [Member]	Mar. 31, 2013 Class B Units [Member] QRE GP [Member]	Mar. 31, 2013 Subsequent Event [Member]	Apr. 25, 2013 Subsequent Event [Member]
Partners' Capital Activity [Line Items]
Percentage of management fee converted to Class B units								80.00%
Issue of units in lieu of management fee			6,133,558					6,133,558
Management incentive fee incurred	$ 0.7
General partner, outstanding (in units)	51,036	51,036		51,036
Class B convertible unitholders, outstanding (in units)	6,133,558	0
Ownership percentage					0.10%	7.50%	29.30%		7.50%
Interest in cash distributions				7.60%
Period of time after quarter available cash is distributed to unitholders	45 days
Date distribution was declared										Apr. 25, 2013
Cash distribution per unit											$ 0.4875
Date distribution will be paid										May 15, 2013
Date unitholders of record										May 08, 2013