Distributions and Net Income Per Limited Partner Unit (Income In Excess Of Distribution) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to the Partnership	$ 14,860	$ 13,733	$ 32,607	$ 28,688
Distributions declared	16,590	16,113	33,181	31,779
Distribution in excess of net income	(1,730)	(2,380)	(574)	(3,091)
IDR Holders [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to the Partnership	0	0	0	0
Distributions declared with respect to the incentive distribution rights	0	0	0	0
Distribution in excess of net income	0	0	0	0
Common units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to the Partnership	14,860	13,733	32,607	28,688
Distributions declared	16,590	16,113	33,181	31,779
Distribution in excess of net income	(1,730)	(2,380)	(574)	(3,091)
Cash Distribution [Member] | Common units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Distributions declared	$ 16,590	$ 16,113	$ 33,181	$ 31,779