Partners' Capital (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Mar. 31, 2013 Class B Units [Member]	Sep. 30, 2013 Class B Units [Member]	Sep. 30, 2013 QRE GP [Member]	Sep. 30, 2013 General Partner [Member] QRE GP [Member]	Sep. 30, 2013 Limited Partner [Member] QRE GP [Member]	Sep. 30, 2013 Limited Partner [Member] Fund [Member]	Mar. 31, 2013 Class B Units [Member]	Dec. 31, 2013 Subsequent Event [Member]	Sep. 30, 2013 Subsequent Event [Member]	Oct. 25, 2013 Subsequent Event [Member]	Jul. 24, 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					6,133,558
Management Incentive Fee Recognized	$ 1.3	$ 0.7	$ 2.0									$ 1.4
Distribution to General Partner											$ 3.0
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%	29.20%
Interest in cash distributions							7.60%
Period of time after quarter available cash is distributed to unitholders			45 days
Date distribution was declared													Oct. 25, 2013
Cash distribution per unit														$ 0.4875	$ 0.4875
Date distribution will be paid													Nov. 14, 2013
Date unitholders of record													Nov. 07, 2013