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Equity - Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands											12 Months Ended
	Feb. 12, 2020	Jan. 24, 2020	Nov. 12, 2019	Aug. 13, 2019	May 14, 2019	Feb. 12, 2019	Nov. 09, 2018	Aug. 13, 2018	May 15, 2018	Feb. 12, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit			$ 0.880	$ 0.850	$ 0.820	$ 0.810	$ 0.790	$ 0.770	$ 0.750	$ 0.725
Total Quarterly Distribution Per Limited Partner Unit, Annualized			$ 3.52	$ 3.40	$ 3.28	$ 3.24	$ 3.16	$ 3.08	$ 3.00	$ 2.90
Total Cash Distribution, including general partner interest and IDRs (in thousands)			$ 30,379	$ 28,914	$ 27,438	$ 26,949	$ 25,960	$ 24,984	$ 23,997	$ 22,777	$ 113,700	$ 97,700	$ 85,600
Less: General partner's IDRs											31,781	24,224	17,389
Total cash distributions											$ 117,365	$ 101,890	$ 87,854
Cash distributions per limited partner unit (in usd per unit)											$ 3.440	$ 3.120	$ 2.835
General Partner
Distribution Made to Limited Partner [Line Items]
General partner's distributions											$ 1,711	$ 1,553	$ 1,408
Less: General partner's IDRs											31,781	24,224	17,389
Total general partner's distributions											33,492	25,777	18,797
Limited Partner
Distribution Made to Limited Partner [Line Items]
Limited partners' distribution											$ 83,873	$ 76,113	$ 69,057
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit	$ 0.885
Total Quarterly Distribution Per Limited Partner Unit, Annualized	$ 3.54
Total Cash Distribution, including general partner interest and IDRs (in thousands)	$ 30,634	$ 30,600

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Annualized per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

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