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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended
	Apr. 24, 2017	Feb. 14, 2017	Nov. 14, 2016	Aug. 12, 2016	May 13, 2016	Mar. 31, 2017	Mar. 31, 2016
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Paid, Per Unit		$ 0.680	$ 0.655	$ 0.630	$ 0.610
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit		$ 2.72	$ 2.62	$ 2.52	$ 2.44
Quarterly cash distributions paid		$ 20,537	$ 19,302	$ 18,085	$ 17,095
Cash distributions per limited partner unit						$ 0.690	$ 0.610
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit	$ 2.76
Cash distributions per limited partner unit	$ 0.690
Quarterly distributions declared	$ 21,024

X

- Definition

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

+ References

No definition available.

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- Definition

Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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+ References

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