Partners' Capital (Allocations of Net Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Partners' Capital [Line Items]
Limited partners’ interest in net income		$ 18,754		$ 43,055
Common Units [Member]
Schedule of Partners' Capital [Line Items]
Distributions	$ 78,889	39,039	$ 235,514	76,172
Distributions in excess of income	(55,640)	(24,035)	(119,888)	(44,349)
Limited partners’ interest in net income	$ 23,249	$ 15,004	$ 115,626	$ 31,823
Cash distribution per common unit (in shares)	$ 0.8255	$ 0.7454	$ 2.4683	$ 2.0838
Subordinated Units-Affiliated [Member]
Schedule of Partners' Capital [Line Items]
Distributions	$ 0	$ 8,154	$ 0	$ 22,796
Distributions in excess of income	0	(4,404)	0	(11,564)
Limited partners’ interest in net income	$ 0	$ 3,750	$ 0	$ 11,232