Partners' Capital (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended								3 Months Ended	9 Months Ended			3 Months Ended
	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Mar. 02, 2014	Dec. 31, 2013	Mar. 31, 2013 Class B Units [Member]	Sep. 30, 2014 Class B Units [Member]	Sep. 30, 2014 GP Buyout Transaction [Member] Class B Units [Member]	Mar. 31, 2014 Forecast [Member]	Sep. 30, 2014 First Monthly Distribution [Member]	Sep. 30, 2014 Second Monthly Distribution [Member]	Sep. 30, 2014 Third Monthly Distribution [Member]	Sep. 30, 2014 Minimum [Member] GP Buyout Transaction [Member] item	Sep. 30, 2014 Minimum [Member] Forecast [Member]	Sep. 30, 2014 Maximum [Member] GP Buyout Transaction [Member] item	Sep. 30, 2014 Maximum [Member] GP Buyout Transaction [Member] Class B Units [Member]	Sep. 30, 2014 Maximum [Member] Forecast [Member]	Mar. 31, 2014 General Partner [Member] QRE GP [Member]	Sep. 30, 2014 Limited Partner [Member] Fund [Member]	Sep. 30, 2014 Limited Partner [Member] QRE GP [Member]	Sep. 30, 2014 Limited Partners-Public Common [Member]	Mar. 31, 2013 Class B Units [Member]	Oct. 31, 2014 Subsequent Event [Member] Second Monthly Distribution [Member]
Partners' Capital Activity [Line Items]
Proceeds from unit offering									$ 100,000,000
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 recognized	700,000	1,400,000	2,000,000
Number units to be distributed for GP Buyout																11,600,000
Distribution to General Partner																						3,000,000
General partner, outstanding (in units)		0		51,036	51,036
Class B convertible unitholders, outstanding (in units)		6,133,558			6,133,558
Ownership percentage																		0.10%	29.20%	7.50%	63.30%
Number of days after quarter distributions paid		45 days								15 days	45 days	75 days
Cash distribution per unit								$ 0.4744		$ 0.1625													$ 0.1625
Distribution coverage ratio													1.0		4.0
Number of Class B units issuable upon merger completion														383,900			6,748,067
Distributions payable		14,212,000			14,155,000
Partners' capital account, units, sold in public offering		0
Proceeds from unit offering, net of offering costs			$ 87,000