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Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income Per Unit [Line Items]
Net income attributable to partners	$ 30,530	$ 23,326	$ 75,112	$ 68,903
Less: Partners' distribution	21,487	19,272	62,256	56,343
Earnings in excess of (less than) distributions	$ 151	$ (2,634)	$ (11,619)	$ (6,038)
Footnote [Abstract]
General partner's ownership interest (as percent)	2.00%	2.00%	2.00%	2.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest, Excess Per Unit Of Cash Distribution			$ 0.43125
Common Units
Net Income Per Unit [Line Items]
Common units - (basic) (in shares)	24,417,285	24,395,183	24,411,308	24,387,995
Common units - (diluted) (in shares)	24,420,582	24,401,908	24,417,466	24,395,880
Common units - (basic) (in dollars per share)	$ 0.89	$ 0.68	$ 2.08	$ 2.07
Common units - (diluted) (in dollars per share)	$ 0.89	$ 0.68	$ 2.08	$ 2.07
General Partner
Net Income Per Unit [Line Items]
Net income attributable to partners	$ 8,895	$ 6,636	$ 24,244	$ 18,478
Less: General partner's distribution (including IDRs)	8,892	6,688	24,475	18,598
Earnings in excess of (less than) distributions	3	(52)	(231)	(120)
Total partner's earnings	8,895	6,636	24,244	18,478
Common unitholders | Common Units
Net Income Per Unit [Line Items]
Less: Partners' distribution	21,487	19,272	62,256	56,343
Earnings in excess of (less than) distributions	148	(2,582)	(11,388)	(5,918)
Total partner's earnings	$ 21,635	$ 16,690	$ 50,868	$ 50,425
Common units - (basic) (in shares)	24,417,285	24,395,183	24,411,308	24,387,995
Common units - (diluted) (in shares)	24,420,582	24,401,908	24,417,466	24,395,880
Common units - (basic) (in dollars per share)	$ 0.89	$ 0.68	$ 2.08	$ 2.07
Common units - (diluted) (in dollars per share)	$ 0.89	$ 0.68	$ 2.08	$ 2.07

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