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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands											12 Months Ended
	Feb. 12, 2019	Jan. 24, 2019	Nov. 09, 2018	Aug. 13, 2018	May 15, 2018	Feb. 12, 2018	Nov. 14, 2017	Aug. 11, 2017	May 12, 2017	Feb. 14, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit			$ 0.790	$ 0.770	$ 0.750	$ 0.725	$ 0.715	$ 0.705	$ 0.690	$ 0.680
Total Quarterly Distribution Per Limited Partner Unit, Annualized			$ 3.16	$ 3.08	$ 3.00	$ 2.90	$ 2.86	$ 2.82	$ 2.76	$ 2.72
Total Cash Distribution, including general partner interest and IDRs (in thousands)			$ 25,960	$ 24,984	$ 23,997	$ 22,777	$ 22,270	$ 21,783	$ 21,024	$ 20,537	$ 101,900	$ 87,900	$ 75,000
Less: General partner's IDRs											24,224	17,389	11,160
Total cash distributions											$ 101,890	$ 87,854	$ 75,019
Cash distributions per limited partner unit (in usd per unit)											$ 3.120	$ 2.835	$ 2.575
General Partner
Distribution Made to Limited Partner [Line Items]
General partner's distributions											$ 1,553	$ 1,408	$ 1,277
Less: General partner's IDRs											24,224	17,389	11,160
Total general partner's distributions											25,777	18,797	12,437
Limited Partner
Distribution Made to Limited Partner [Line Items]
Limited partners' distribution											76,113	69,057	62,582
Limited Partner | Common Units
Distribution Made to Limited Partner [Line Items]
Limited partners' distribution											76,113	69,057	58,158
Limited Partner | Subordinated
Distribution Made to Limited Partner [Line Items]
Limited partners' distribution											$ 0	$ 0	$ 4,424
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit	$ 0.810
Total Quarterly Distribution Per Limited Partner Unit, Annualized	$ 3.24
Total Cash Distribution, including general partner interest and IDRs (in thousands)	$ 26,949	$ 26,900

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