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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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-Topic 505
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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-Name Regulation S-X (SX)
-Number 210
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-Article 3

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Distribution payment targets and thresholds for determination of limited and general partners' marginal percentage interests in distributions.

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Dividend Arrearges, Common Limited Partner Units

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Percentage of incentive cash distribitions allocated to the general partner.

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Percentage split between the limited partners' and general partner's interests in distributions.

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Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution						$ 1,085	$ 0	$ 0
Distribution Made to Limited Partner, Cash Distributions Paid						66,999	53,436
Partners' Capital Account, Distributions						$ 68,084	$ 53,436
Cash distributions declared per common unit		$ 0.3825	$ 0.3650	$ 0.3475	$ 0.3325	$ 1.4275	$ 1.1632	$ 0
Dividend Arrearges, Common Limited Partner Units									$ 0
General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Cash Distribution Allocation		100.00%				100.00%
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Cash distributions declared per common unit	$ 0.3925
Common Units [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid						$ 34,436	$ 26,902
Subordinated Units [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid						$ 32,563	$ 26,534
Minimum Quarterly Distribution [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Payment Targets						$0.2875
Minimum Quarterly Distribution [Member] \| General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						0.00%
Minimum Quarterly Distribution [Member] \| Public [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						100.00%
First Target Distribution [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Payment Targets						above $0.2875 up to $0.3306
First Target Distribution [Member] \| General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						0.00%
First Target Distribution [Member] \| Public [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						100.00%
Second Target Distribution [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Payment Targets						above $0.3306 up to $0.3594
Second Target Distribution [Member] \| General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						15.00%
Second Target Distribution [Member] \| Public [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						85.00%
Third Target Distribution [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Payment Targets						above $0.3594 up to $0.4313
Third Target Distribution [Member] \| General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						25.00%
Third Target Distribution [Member] \| Public [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						75.00%
Target Distribution After Third Target [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Payment Targets						above $0.4313
Target Distribution After Third Target [Member] \| General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						50.00%
Target Distribution After Third Target [Member] \| Public [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution Split Marginal Percentage						50.00%