Distributions and Net Income Per Limited Partner Unit (Basic and Diluted Income Per Limited Partner Unit) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Limited Partners' Capital Account [Line Items]
Distributions declared	$ 16,600	$ 16,593
Distribution in excess of net income	(406)	(1,447)
Net income	$ 16,194	$ 15,146
Weighted average limited partner units outstanding (basic and diluted) (in units)	35,214,416	35,198,903
Common units
Limited Partners' Capital Account [Line Items]
Distributions declared	$ 16,600	$ 16,593
Distribution in excess of net income	(406)	(1,447)
Net income	$ 16,194	$ 15,146
Weighted average limited partner units outstanding (basic and diluted) (in units)	35,214,416	35,198,903
Weighted average units outsanding:
Common units (in usd per share)	$ 0.46	$ 0.43
IDR Holders
Limited Partners' Capital Account [Line Items]
Subsequent distribution to IDR holders	$ 0	$ 0
Distribution in excess of net income	0	0
Net income	$ 0	$ 0