Partners' Capital (Allocations of Net Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Partners' Capital [Line Items]
Limited partners' interest in net income	$ 41,512	$ 15,313
Distributions declared per unit to unitholders as of record date	$ 0.8173	$ 0.6450
Common Units [Member]
Schedule of Partners' Capital [Line Items]
Distributions	$ 77,921	$ 16,057
Distributions in excess of income	(39,843)	(5,525)
Limited partners' interest in net income	$ 38,078	$ 10,532
Distributions declared per unit to unitholders as of record date	$ 0.8173	$ 0.6450
Subordinated Units-Affiliated [Member]
Schedule of Partners' Capital [Line Items]
Distributions		$ 7,056
Distributions in excess of income		(2,275)
Limited partners' interest in net income		$ 4,781