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

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

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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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Percentage of incentive cash distribitions allocated to the general partner.

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Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						$ 89,082
Incentive Distribution, Distribution						4,447	$ 1,085	$ 0
Distribution Made to Limited Partner, Cash Distributions Paid						84,635	66,999	53,436
Partners' Capital Account, Distributions						$ 89,392	$ 68,084	$ 53,436
Cash distributions declared per common unit		$ 0.4225	$ 0.4125	$ 0.4025	$ 0.3925	$ 1.6300	$ 1.4275	$ 1.1632
Dividend Arrearges, Common Limited Partner Units		$ 0				$ 0
General Partner [Member]
Distribution Made to Limited Partner [Line Items]
Incentive Cash Distribution Allocation							100.00%
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Cash distributions declared per common unit	$ 0.4375
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%
Subordinated Units [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						$ 37,182	$ 32,563	$ 26,534
Distribution Made to Limited Partner, Cash Distributions Paid						37,182	32,563	26,534
TexNew Mex Units [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						0	310	0
Distribution Made to Limited Partner, Cash Distributions Paid						310	0	0
Common Units [Member]
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared						47,453	34,436	26,902
Distribution Made to Limited Partner, Cash Distributions Paid						$ 47,453	$ 34,436	$ 26,902