Southcross Energy Partners 10-Q 6 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 04, 2014	Aug. 04, 2014	Aug. 06, 2014
		Subordinated Units [Member]	Class B Common Units [Member]	Limited Partner, units authorized
Entity Registrant Name	'Southcross Energy Partners, L.P.	'	'	'
Entity Central Index Key	'0001547638	'	'	'
Document Type	'10-Q	'	'	'
Document Period End Date	30-Jun-14	'	'	'
Amendment Flag	'false	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'
Entity Current Reporting Status	'Yes	'	'	'
Entity Filer Category	'Accelerated Filer	'	'	'
Entity Common Stock, Shares Outstanding	'	12,213,713	14,633,000	23,497,782
Document Fiscal Year Focus	'2014	'	'	'
Document Fiscal Period Focus	'Q2	'	'	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$10,908	$3,349
Trade accounts receivable	63,925	57,669
Prepaid expenses	1,285	3,061
Other current assets	6,588	5,105
Total current assets	82,706	69,184
Property, plant and equipment, net	662,755	575,795
Intangible assets, net	1,539	1,568
Other assets	5,280	5,768
Total assets	752,280	652,315
Current liabilities:	'	'
Accounts payable and accrued liabilities	84,214	62,451
Other current liabilities	5,984	5,344
Total current liabilities	90,198	67,795
Long-term debt	226,850	267,300
Other non-current liabilities	2,256	1,692
Total liabilities	319,304	336,787
Commitments and contingencies	'	'
Partners' capital:	'	'
Accumulated other comprehensive loss	0	-210
Total partners' capital	386,171	275,024
Liabilities, preferred units, and partners' capital:	'	'
Total liabilities, preferred units and partners' capital	752,280	652,315
Limited Partner, units authorized	'	'
Partners' capital:	'	'
Total partners' capital	289,465	169,141
Subordinated Units [Member]	'	'
Partners' capital:	'	'
Total partners' capital	87,887	99,726
General Partner interest [Member]	'	'
Partners' capital:	'	'
General Partner interest	8,819	6,367
Total partners' capital	8,819	6,367
Series A convertible preferred units	'	'
Preferred units of Southcross Energy LLC:	'	'
Series A convertible preferred units (1,832,399 and 1,769,915 units issued and outstanding as of June 30, 2014 and December 31, 2013, respectively)	$46,805	$40,504

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)	Jun. 30, 2014	Dec. 31, 2013
Limited Partner, units authorized	'	'
Partners' capital:	'	'
Limited Partner, units authorized	23,163,713	13,963,713
Limited Partner, units issued	21,465,046	12,253,985
Limited Partner, units outstanding	21,454,119	12,253,985
Subordinated Units [Member]	'	'
Partners' capital:	'	'
Limited Partner, units authorized	12,213,713	'
Limited Partner, units issued	12,213,713	12,213,713
Limited Partner, units outstanding	12,213,713	12,213,713
Series A convertible preferred units	'	'
Partners' capital:	'	'
Preferred units, units issued	1,832,399	1,769,915
Preferred units, units outstanding	1,832,399	1,769,915

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	$195,063,000	$154,703,000	$408,654,000	$298,954,000
Expenses:	'	'	'	'
Cost of natural gas and liquids sold	168,826,000	133,407,000	355,229,000	258,795,000
Operations and maintenance	11,745,000	10,284,000	22,606,000	20,173,000
Depreciation and amortization	8,978,000	8,261,000	17,506,000	15,510,000
General and administrative	6,693,000	5,582,000	12,796,000	11,623,000
Gain on sale of assets	-45,000	0	-42,000	0
Total expenses	196,197,000	157,534,000	408,095,000	306,101,000
Income (loss) from operations	-1,134,000	-2,831,000	559,000	-7,147,000
Interest expense	-1,771,000	-3,101,000	-4,744,000	-5,148,000
Loss before income tax expense	-2,905,000	-5,932,000	-4,185,000	-12,295,000
Interest expense	-56,000	-260,000	-64,000	-279,000
Net loss	-2,961,000	-6,192,000	-4,249,000	-12,574,000
Series A convertible preferred unit in-kind distribution	-6,301,000	-560,000	'	-560,000
Series A preferred unit valuation adjustment to maximum redemption value	-5,062,000	-4,666,000	-5,029,000	-4,666,000
Net loss attributable to partners	-8,761,000	-11,418,000	-10,550,448	-17,800,000
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner Minimum Quarterly Distributions Declared Per Unit	$0.40	'	$0.40	'
General Partner [Member]	'	'	'	'
Expenses:	'	'	'	'
Net loss	-59,000	-124,000	-84,000	'
Net Income (Loss) Allocated to General Partners	'	'	-85,000	-252,000
Limited Partners	'	'	'	'
Expenses:	'	'	'	'
Net loss	-8,702,000	-11,294,000	-10,466,000	-17,548,000
Net loss attributable to partners	'	'	-10,550,000	'
Common Limited Partners [Member]	'	'	'	'
Expenses:	'	'	'	'
Net loss	'	-6,168,000	'	'
Earnings per unit and distributions declared	'	'	'	'
Net loss allocated to limited partner, basic and diluted	-7,382,000	-7,982,000	-8,398,000	-11,108,000
Weighted average number of limited partner units outstanding, basic and diluted	21,472,420	12,222,692	19,887,523	12,218,178
Basic and diluted loss per unit (in dollars per unit)	($0.34)	($0.65)	($0.42)	($0.91)
Subordinated Limited Partners [Member]	'	'	'	'
Earnings per unit and distributions declared	'	'	'	'
Net loss allocated to limited partner, basic and diluted	-1,320,000	-3,312,000	-2,068,000	-6,439,571
Weighted average number of limited partner units outstanding, basic and diluted	12,213,713	12,213,713	12,213,713	12,213,713
Basic and diluted loss per unit (in dollars per unit)	($0.11)	($0.27)	($0.17)	($0.53)
Series A convertible preferred units	'	'	'	'
Expenses:	'	'	'	'
Series A convertible preferred unit in-kind distribution	-738,000	'	-1,272,000	'
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner Minimum Quarterly Distributions Declared Per Unit	'	'	$0.40	'
Cash Distribution [Member]	'	'	'	'
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner Minimum Quarterly Distributions Declared Per Unit	$0.40	$0.40	'	'
Distribution Made to Member or Limited Partner, Distribution Paid in Cash	13,768,000	9,986,000	'	'
Cash Distribution [Member] | General Partner [Member]	'	'	'	'
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner, Distribution Paid in Cash	290,000	210,000	'	'
Cash Distribution [Member] | Subordinated Limited Partners [Member] | Limited Partners	'	'	'	'
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner Minimum Quarterly Distributions Declared Per Unit	$0.40	$0.40	'	'
Distribution Made to Member or Limited Partner, Distribution Paid in Cash	4,885,485	4,886,000	0	0
Cash Distribution [Member] | Common Limited Partners [Member] | Limited Partners	'	'	'	'
Earnings per unit and distributions declared	'	'	'	'
Distribution Made to Member or Limited Partner Minimum Quarterly Distributions Declared Per Unit	$0.40	$0.40	$0.80	$0.80
Distribution Made to Member or Limited Partner, Distribution Paid in Cash	$8,593,000	$4,890,000	'	'

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net loss	($2,961)	($6,192)	($4,249)	($12,574)
Other comprehensive income (loss):	'	'	'	'
Hedging losses reclassified to earnings and recognized in interest expense	106	100	221	194
Adjustment in fair value of derivatives	0	40	-11	-30
Total other comprehensive income	106	140	210	164
Comprehensive loss	($2,855)	($6,052)	($4,039)	($12,410)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:	'	'
Net loss	($4,249)	($12,574)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	17,506	15,510
Unit-based compensation	1,611	1,093
Amortization of deferred financing costs	675	602
Gain on sale of assets	-42	0
Unrealized loss on financial instruments	312	0
Other, net	54	19
Changes in operating assets and liabilities:	'	'
Trade accounts receivable	-5,526	2,349
Prepaid expenses and other current assets	2,128	823
Other non-current assets	-20	-69
Accounts payable and accrued liabilities	12,107	-7,123
Other liabilities	-855	-966
Net cash provided by (used in) operating activities	23,701	-336
Cash flows from investing activities:	'	'
Capital expenditures	-55,891	-69,449
Expenditures for assets subject to property damage claims, net of insurance proceeds and deductibles	-970	-2,622
Proceeds from sale of assets	45	24
Proceeds from sale of assets	-38,636	0
Net cash used in investing activities	-95,452	-72,047
Cash flows from financing activities:	'	'
Proceeds from issuance of common units, net	144,671	0
Borrowings under our credit agreements	134,000	85,500
Repayments under our credit agreements	-174,450	-40,000
Payments on capital lease obligations	-307	-261
Financing costs	-166	-2,045
Proceeds from issuance of Series A convertible preferred units, net of issuance costs	0	38,835
Contributions from general partner	3,115	800
Payments of distributions and distribution equivalent rights	-27,516	-15,955
LTIP tax withholdings on vested units	-37	0
Net cash provided by financing activities	79,310	66,874
Cash and cash equivalents b Beginning of period	3,349	7,490
Cash and cash equivalents b End of period	10,908	'
Cash and Cash Equivalents, Period Increase (Decrease)	$7,559	($5,509)

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)

Total

Series A Preferred Stock [Member]

Accumulated Other Comprehensive Loss [Member]

Accumulated Other Comprehensive Loss [Member]

Limited Partners

Common

Common

Subordinated

Subordinated

Subordinated

Subordinated

General Partner [Member]

General Partner [Member]

Common Units [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Subordinated Units [Member]

Series A Preferred Stock [Member]

Subordinated Units [Member]

Series A Preferred Stock [Member]

Common

BALANCE - December 31, 2013 at Dec. 31, 2012

$326,467,000

'

($477,000)

'

'

$194,365,000

'

$125,951,000

'

'

'

$6,628,000

'

'

Increase (Decrease) in Shareholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-12,574,000

'

'

'

-17,548,000

'

'

'

'

'

'

'

'

'

Net loss allocated to limited partner, basic and diluted

'

'

'

'

'

-11,108,000

'

-6,439,571

-6,165,000

'

'

'

'

'

Net Income (Loss) Allocated to General Partners

'

'

'

'

'

'

'

'

'

'

'

-241,000

'

'

Series A convertible preferred unit in-kind distribution and fair value adjustment

-560,000

'

'

'

'

'

'

'

'

'

'

'

'

'

BALANCE - June 30, 2014 at Jun. 30, 2013

294,376,000

'

'

'

'

176,138,000

'

111,694,000

'

'

'

6,857,000

'

'

BALANCE - December 31, 2013 at Mar. 31, 2013

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Shareholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-6,192,000

'

0

'

-11,294,000

-6,168,000

'

'

'

'

'

-124,000

'

'

Net loss allocated to limited partner, basic and diluted

'

'

'

'

'

-7,982,000

'

-3,312,000

'

'

'

'

'

'

Unit-based compensation on long-term incentive plan

800,000

-560,000

0

0

'

800,000

-275,000

0

'

-274,000

'

0

-11,000

'

Series A convertible preferred unit in-kind distribution and fair value adjustment

-560,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Contributions from general partner

'

'

'

'

'

'

'

'

'

'

'

800,000

'

'

Cash distributions paid

-15,955,000

-4,666,000

0

0

'

-7,818,000

-4,666,000

-7,818,000

'

0

'

-319,000

0

'

Net effect of cash flow hedges

164,000

0

164,000

0

'

0

0

0

'

0

'

0

0

'

BALANCE - June 30, 2014 at Jun. 30, 2013

294,376,000

'

-313,000

'

'

176,138,000

'

111,694,000

'

'

'

6,857,000

'

'

BALANCE - December 31, 2013 at Dec. 31, 2013

275,024,000

'

-210,000

'

'

169,141,000

'

99,726,000

'

'

'

6,367,000

'

'

Increase (Decrease) in Shareholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-4,249,000

'

0

'

-10,466,000

'

'

'

'

'

'

-84,000

'

'

Net loss allocated to limited partner, basic and diluted

'

'

'

'

'

-8,398,000

'

-2,068,000

'

'

-1,584,000

'

'

-2,580,000

Unit-based compensation on long-term incentive plan

1,513,000

'

0

'

'

1,513,000

'

0

'

'

'

0

'

'

Series A convertible preferred unit in-kind distribution and fair value adjustment

'

'

0

'

'

'

'

'

'

'

'

'

'

'

Contributions from general partner

'

'

0

'

'

'

'

'

'

'

'

'

'

'

Cash distributions paid

-27,516,000

'

0

'

'

-17,166,000

'

-9,771,000

'

'

'

-579,000

'

'

Accrued distribution on long-term incentive plan

-259,000

'

0

'

'

-259,000

'

0

'

'

'

0

'

'

LTIP tax withholdings on vested units

'

'

0

'

'

'

'

0

'

'

'

0

'

'

General partner unit in-kind distribution

'

'

0

'

'

'

'

'

'

'

'

'

'

'

Net effect of cash flow hedges

210,000

'

210,000

'

'

0

'

0

'

'

'

0

'

'

BALANCE - June 30, 2014 at Jun. 30, 2014

386,171,000

'

0

'

'

289,465,000

'

87,887,000

'

'

'

8,819,000

'

'

BALANCE - December 31, 2013 at Mar. 31, 2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Shareholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-2,961,000

'

'

'

-8,702,000

'

'

'

'

'

'

-59,000

'

'

Net loss allocated to limited partner, basic and diluted

'

'

'

'

'

-7,382,000

'

-1,320,000

'

'

'

'

'

'

Series A convertible preferred unit in-kind distribution and fair value adjustment

-6,301,000

'

'

'

'

'

-5,802,000

'

'

-474,000

'

'

-25,000

'

Contributions from general partner

'

'

'

'

'

0

'

0

'

'

'

3,115,000

'

'

LTIP tax withholdings on vested units

-37,000

'

'

'

'

-37,000

'

'

'

'

'

'

'

'

General partner unit in-kind distribution

0

'

'

'

'

-16,000

'

-10,000

'

'

'

26,000

'

'

BALANCE - June 30, 2014 at Jun. 30, 2014

$386,171,000

'

'

'

'

$289,465,000

'

$87,887,000

'

'

'

$8,819,000

'

'

ORGANIZATION_AND_DESCRIPTION_O

ORGANIZATION AND DESCRIPTION OF BUSINESS	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
ORGANIZATION AND DESCRIPTION OF BUSINESS	'
	ORGANIZATION, DESCRIPTION OF BUSINESS
	Organization
	Southcross Energy Partners, L.P. (the "Partnership," "Southcross," "we," "our" or "us") is a Delaware limited partnership formed in April 2012. Our common units are listed on the New York Stock Exchange under the symbol “SXE.” Southcross Energy LLC is a Delaware limited liability company. Prior to the closing of the combination of Southcross Energy LLC and TexStar Midstream Services, LP ("TexStar") on August 4, 2014, Southcross Energy LLC held all of the equity interests in Southcross Energy Partners GP, LLC, a Delaware limited liability company and our general partner (“General Partner”), all of our subordinated units, as well as a portion of our common units and Series A Convertible Preferred Units (“Series A Preferred Units”). Southcross Energy LLC is controlled through investment funds and entities associated with Charlesbank Capital Partners, LLC ("Charlesbank").
	On August 4, 2014, Southcross Energy LLC and TexStar combined and created a newly formed partnership, Southcross Holdings LP ("Holdings"). Holdings owns 100% of our General Partner (and thus controls us) and certain other equity interests in us, as well as 100% of the equity of TexStar. EIG Global Energy Partners, Charlesbank Capital Partners and Tailwater Capital LLC each indirectly own approximately one-third of Holdings. Simultaneously with the closing of the combination transactions, we acquired the Rich Gas System which was under common control of TexStar (the "TexStar Rich Gas System"). For additional details regarding the transactions see Note 14.
	Description of Business
	We are a master limited partnership that provides natural gas gathering, processing, treating, compression and transportation services and NGL fractionation and transportation services. We also source, purchase, transport and sell natural gas and NGLs. Our assets are located in South Texas, Mississippi and Alabama and, as of June 30, 2014, include three gas processing plants, two fractionation plants and our pipelines. We are headquartered in Dallas, Texas and our operations are managed as and presented in one reportable segment.
	Segments
	Our chief operating decision-maker is our General Partner’s Chief Executive Officer who reviews financial information presented on a consolidated basis in order to make decisions about resource allocations and assess our performance. There are no segment managers who are held accountable by the chief operating decision-maker, or anyone else, for operations, operating results, and planning for levels or components below the consolidated unit level. Accordingly, we have determined that we have one reportable segment.

BASIS_OF_PRESENTATION_AND_SUMM

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	Basis of Presentation
	We prepared this Quarterly Report on Form 10-Q under the rules and regulations of the Securities and Exchange Commission and in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial statements. Accordingly, these condensed consolidated financial statements do not include all of the disclosures required by GAAP and should be read with our 2013 Annual Report on Form 10-K. The condensed consolidated financial statements as of June 30, 2014 and December 31, 2013, and for the three and six months ended June 30, 2014 and 2013, are unaudited and have been prepared on the same basis as the audited financial statements included in our 2013 Annual Report on Form 10-K.  All intercompany accounts and transactions have been eliminated in the preparation of the accompanying condensed consolidated financial statements. The condensed consolidated financial statements reflect the assets acquired and liabilities assumed as of June 30, 2014 and the operating results for the period from March 6, 2014 through June 30, 2014 associated with the acquisition discussed further in Note 2. Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included herein.
	The accompanying unaudited condensed consolidated financial statements were prepared in conformity with GAAP, which requires management to make various estimates and assumptions that may affect the amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Actual results may differ from those estimates. Information for interim periods may not be indicative of our operating results for the entire year.
	The disclosures included in this Quarterly Report on Form 10-Q provide an update to our 2013 Annual Report on Form 10-K.
	We evaluate events that occur after the balance sheet date, but before the financial statements are issued, for potential recognition or disclosure.  Based on the evaluation, we determined that there were no material subsequent events for recognition or disclosure other than those disclosed in this Quarterly Report.
	Significant Accounting Policies
	During the second quarter of 2014, there were no material changes to our significant accounting policies described in Note 1 of our 2013 Annual Report on Form 10-K.
	Recent Accounting Pronouncements
	Accounting standard-setting organizations frequently issue new or revised accounting rules. We regularly review new pronouncements to determine their impact, if any, on our consolidated financial statements.
	In May 2014, the Financial Accounting Standard Board and the International Accounting Standard Board jointly issued a comprehensive new revenue recognition standard that will supersede nearly all existing revenue recognition guidance under GAAP and International Financial Reporting Standards. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. We are required to adopt this standard beginning in the first quarter of 2017. The adoption could have a significant impact on our consolidated financial statements.

ACQUISITION

ACQUISITION	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Acquisition	'
	ACQUISITIONS
	On March 6, 2014, our subsidiary, Southcross Nueces Pipelines LLC, acquired natural gas pipelines near Corpus Christi, Texas and contracts related to these pipelines from Onyx Midstream, LP and Onyx Pipeline Company (collectively, “Onyx”) for $38.6 million in cash, net of certain adjustments as provided in the purchase agreement.
	The pipelines transport natural gas to two power plants in Nueces County, Texas under fixed-fee contracts that extend through 2029 and include an option to extend the agreements by an additional term of up to ten years. The contracts were renegotiated in connection with the acquisition; therefore we consider these contracts to be assumed at fair market value.
	The fair values of the property, plant and equipment are based upon assumptions related to expected future cash flows, discount rates and asset lives using currently available information. We utilized a mix of the cost, income and market approaches to determine the estimated fair values of such assets. The fair value measurements and models have been classified as non-recurring Level 3 measurements.
	We performed our assessment of the fair value of the assets acquired and liabilities assumed and the consideration given was considered equal to the fair value of net assets acquired. As a result, no goodwill was recorded. The assessment was finalized during three months ended June 30, 2014 and there were no changes to the preliminary balances previously recorded.
	The reconciliation of the fair value of the assets acquired and liabilities assumed related to the Onyx purchase price was as follows (in thousands):
	Purchase Price—Cash	$	38,636
	Current assets	730
	Property, plant and equipment	39,413
	Total assets acquired	40,143
	Current liabilities assumed	(1,407		)
	Other liabilities assumed	(100		)
	Net identifiable assets acquired	$	38,636
	During the six months ended June 30, 2014, we expensed $0.3 million of transaction costs associated with the acquisition. These costs are reported within general and administrative expenses in our statement of operations.
	The following unaudited pro forma financial information for the three months ended June 30, 2013 and the six months ended June 30, 2014 and 2013 assumes that the pipeline acquisition from Onyx occurred on January 1, 2013 and includes adjustments for income from operations, including depreciation and amortization, as well as the effects of financing the acquisition (in thousands, except unit information):
		Three months ended June 30,			Six months ended June 30,
		2013			2014			2013
	Total revenue	$	155,754		$	409,303		$	301,041
	Net loss	(6,740		)	(4,357		)	(13,984		)
	Net loss attributable to common unitholders	(8,275		)	(8,463		)	(11,863		)
	Net loss per common unit—(basic and diluted)	(0.56		)	(0.43		)	(0.81		)
	Net loss attributable to subordinated unitholders	(3,556		)	(2,109		)	(7,069		)
	Net loss per subordinated unit—(basic and diluted)	(0.29		)	(0.17		)	(0.58		)
	The unaudited pro forma information is not necessarily indicative of what our statements of operations would have been if the transaction had occurred on that date, or what the financial position or results from operations will be for any future periods. For the three months ended June 30, 2014, Onyx contributed $1.3 million in revenues and $0.4 million in net income to our statements of operations. For the six months ended June 30, 2014, Onyx contributed $1.6 million in revenues and $0.3 million in net income to our statements of operations.
	As discussed in Note 14, we acquired the TexStar Rich Gas System on August 4, 2014.

NET_LOSS_INCOME_PER_LIMITED_PA

NET (LOSS) INCOME PER LIMITED PARTNER UNIT AND DISTRIBUTIONS	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
NET LOSS PER LIMITED PARTNER UNIT AND DISTRIBUTIONS	'
	NET LOSS PER LIMITED PARTNER UNIT AND DISTRIBUTIONS
	Net Loss Per Limited Partner Unit
	The following is a reconciliation of the net loss attributable to our limited partners and our limited partner units and the basic and diluted earnings per unit calculations for the three and six months ended June 30, 2014 and 2013 (in thousands, except unit and per unit data):
		Three Months Ended June 30,								Six Months Ended June 30,
		2014				2013				2014				2013
	Net loss	$	(2,961	)		$	(6,192	)		$	(4,249	)		$	(12,574	)
	Series A Preferred Unit in-kind distribution and fair value adjustment (1)	(5,800		)		(5,226		)		(6,301		)		(5,226		)
	Net loss attributable to partners	$	(8,761	)		$	(11,418	)		$	(10,550	)		$	(17,800	)
	General partner's interest (2)	$	(59	)		$	(124	)		$	(84	)		$	(252	)
	Limited partners' interest (2)
	Common	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Subordinated	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	(1) The Series A Preferred Unit in-kind distribution increased the net loss attributable to partners as of June 30, 2014 in the calculation of earnings per unit (See Note 9) for the three months ended June 30, 2014. The valuation adjustment to maximum redemption value of the Series A Preferred Units as of June 30, 2014 increased the net loss available to common units in the calculation of earnings per unit (See Note 9) for the three months ended June 30, 2014 and 2013 and the six months ended June 30, 2014 and 2013.
	(2) General Partner's and Limited Partners’ interest are calculated based on the allocation of net losses for the period net of the allocation of Series A Preferred Unit in-kind distributions, Series A Preferred Unit fair value adjustments and General Partner unit in-kind distributions.
		Three Months Ended June 30,								Six Months Ended June 30,
	Common Units	2014				2013				2014				2013
	Interest in net loss	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Effect of dilutive units - numerator (1)	—				—				—				—
	Dilutive interest in net loss	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Weighted-average units - basic	21,472,420				12,222,692				19,887,523				12,218,178
	Effect of dilutive units - denominator (1)	—				—				—				—
	Weighted-average units - dilutive	21,472,420				12,222,692				19,887,523				12,218,178
	Basic and diluted net loss per common unit	$	(0.34	)		$	(0.65	)		$	(0.42	)		$	(0.91	)
		Three Months Ended June 30,								Six Months Ended June 30,
	Subordinated Units	2014				2013				2014				2013
	Interest in net loss	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	Effect of dilutive units - numerator (1)	—				—				—				—
	Dilutive interest in net loss	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	Weighted-average units - basic	12,213,713				12,213,713				12,213,713				12,213,713
	Effect of dilutive units - denominator (1)	—				—				—				—
	Weighted-average units - dilutive	12,213,713				12,213,713				12,213,713				12,213,713
	Basic and diluted net loss per subordinated unit	$	(0.11	)		$	(0.27	)		$	(0.17	)		$	(0.53	)
	(1) Because we had a net loss for the three and six months ended June 30, 2014 and 2013, the effect of the dilutive units would be anti-dilutive to the per unit calculation. Therefore, the weighted average units outstanding are the same for basic and dilutive net loss per unit. The weighted average units that would be included in the computation of diluted per unit amounts in accordance with the treasury stock method were 51,334 and 21,287 unvested awards granted under our long-term incentive plan (See Note 11) and 1,832,399 and 1,816,556 Series A Preferred Units (See Note 9) for the three and six months ended June 30, 2014, respectively. The amount of unvested common units that were not included in the computation of diluted per unit amounts were 161,400 and 148,506 unvested awards granted under our long-term incentive plan and 1,398,667 and 703,197 Series A Preferred Units for the three and six months ended June 30, 2013. Diluted net income per limited partner unit reflects the potential dilution that could occur if securities or agreements to issue common units, such as awards under the long-term incentive plan, were exercised, settled or converted into common units. When it is determined that potential common units resulting from an award should be included in the diluted net income per limited partner unit calculation, the impact is reflected by applying the treasury stock method.
	Our calculation of the number of weighted-average units outstanding include the common units that have been awarded to our directors that are deferred under our Non-Employee Director Deferred Compensation Plan.
	The Series A Preferred Units are considered participating securities for purposes of the basic earnings per unit calculation during periods in which they receive cash distributions.  We are required to pay in-kind distributions to the Series A Preferred Units for the first four full quarters beginning the quarter ended June 30, 2013, and continuing until the Series A Preferred Units have been converted into common units (See Note 9). Because the Series A Preferred Units have received in-kind distributions, they have been excluded from the basic earnings per unit calculation for the three and six months ended June 30, 2014. In connection with the combination of Southcross Energy LLC and TexStar on August 4, 2014 (see Note 14 for details), all holders of the Series A Preferred Units elected to convert their Series A Preferred Units into common units.
	Distributions
	Our current partnership agreement (“Partnership Agreement”) requires that, within 45 days after the end of each quarter, we distribute all of our available cash to unitholders of record on the applicable record date, as determined by our General Partner. We intend to make a minimum quarterly distribution to the holders of our common units and subordinated units of $0.40 per unit to the extent we have sufficient cash from our operations after the establishment of cash reserves and the payment of costs and expenses, including reimbursements of expenses to our General Partner. However, there is no guarantee that we will pay the minimum quarterly distribution on our units in any quarter. Beginning with the third quarter of 2014, until such time we have a distributable cash flow divided by cash distributions (“Distributable Cash Flow Ratio”) of at least 1.0, the holder of the subordinated units has waived the right to receive distributions on any subordinated units that would cause the Distributable Cash Flow Ratio to be less than 1.0.
	Paid In-Kind Distributions
	During the second quarter of 2013, we raised $40.0 million of equity through issuances of 1,715,000 Series A Preferred Units and an additional General Partner contribution to satisfy the requirements of the second amendment to our $350.0 million Second Amended and Restated Credit Agreement with Wells Fargo Bank, N.A., as administrative agent, and a syndicate of lenders (as amended, our “Credit Facility”) (See Note 6 and Note 9). Under the terms of our Partnership Agreement, we were required to pay the holders of our Series A Preferred Units quarterly distributions of in-kind Series A Preferred Units for the first four full quarters following the issuance of the units and continuing thereafter until the board of directors of our General Partner determined to begin paying quarterly distributions in cash.  In-kind distributions were in the form of Series A Preferred Units at a rate of $0.40 per outstanding Series A Preferred Unit per quarter (or 7% per year of the per unit purchase price) or, beginning after four full quarters, such higher per unit rate as is paid in respect to our common units. Cash distributions will equal the greater of $0.40 per unit per quarter or the quarterly distribution paid with respect to each common unit. In accordance with the Partnership Agreement, our General Partner received a corresponding distribution of in-kind general partner units to maintain its 2.0% interest in us.
	The following table represents the paid in-kind (“PIK”) distribution earned for the period ended June 30, 2014 and the PIK distribution for the previous periods (in thousands, except per unit and in-kind distribution units):
	Payment Date	Attributable to the Quarter Ended		Per Unit Distribution					In-Kind Series A			In-Kind				In-Kind		In-Kind General Partner Distribution Value(3)
									Preferred Unit			Series A				Unit
									Distributions to Series A Preferred Holders			Preferred				Distribution
												Distributions				to General
												Value(3)				Partner
	2014
	August 14, 2014	June 30, 2014		$	0.4				32,066			$	738			654		$	15
	May 15, 2014	March 31, 2014		0.4					31,513			534				643		11
	2013
	February 14, 2014	December 31, 2013		0.4					30,971			558				632		11
	November 14, 2013	September 30, 2013		0.4					30,439			511				621		10
	August 14, 2013	June 30, 2013		0.35			(1)		22,276			512				454		10
	14-Aug-13	30-Jun-13		0.2			(2)		2,199			51				45		1
	(1) Per unit distribution of $0.35 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the issuance of 1,466,325 Series A Preferred Units and 29,925 general partner units on April 12, 2013.
	(2) Per unit distribution of $0.20 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the issuance of 248,675 Series A Preferred Units and 5,075 general partner units on May 15, 2013.
	(3) The fair value was calculated as required, based on the common unit price at the quarter end date for the period attributable to the distribution, multiplied by the number of units distributed.
	The Series A Preferred Units were convertible into common units based on an exchange ratio of 110.0% of the Series A Preferred Units if a third party acquires majority ownership control of our General Partner or we sell substantially all of our assets. In connection with the combination of Southcross Energy LLC and TexStar (see Note 14 for details), all holders of the Series A Preferred Units elected to convert their Series A Preferred Units into 2,015,638 common units based on the 110.0% exchange ratio. As a result of the conversion, the Series A Preferred Unit holders (and the corresponding general partner units) did not receive a PIK distribution for the quarter ended June 30, 2014, but will receive a cash distribution on the converted units.
	Cash Distributions
	The following table represents our distribution declared for the period ended June 30, 2014 and distributions paid for the prior periods (in thousands, except per unit data):
								Distributions
		Attributable to the		Per Unit				Limited Partners
	Payment Date	Quarter Ended		Distribution				Common				Subordinated				General Partner			Total
	2014
August 14, 2014	June 30, 2014		$	0.4		(1)	$	8,593			$	4,885			$	290		$	13,768
15-May-14	March 31, 2014		0.4				8,586				4,885				290			13,761
2013
February 14, 2014	December 31, 2013		0.4				8,581				4,885				289			13,755
November 14, 2013	September 30, 2013		0.4				4,888				4,885				214			9,987
August 14, 2013	June 30, 2013		0.4				4,890				4,886				210			9,986
15-May-13	March 31, 2013		0.4				4,888				4,886				199			9,973
2012
February 14, 2013	December 31, 2012		0.24			(2)	2,931				2,931				120			5,982
(1) The common unit distribution in the table above does not include the distribution payment to the Series A Unit holders that converted Series A Units into common units or units that vested as part of the LTIP as a result of the combination of Southcross Energy LLC and TexStar (see Note 11 and Note 14 for details).
(2) Per unit distribution of $0.24 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the closing of our initial public offering on November 7, 2012.
Also, in accordance with our long-term incentive plan, we pay distribution equivalent rights to holders of units granted under that plan that vest during the year (See Note 11).

FINANCIAL_INSTRUMENTS

FINANCIAL INSTRUMENTS	6 Months Ended
	Jun. 30, 2014
Investments, All Other Investments [Abstract]	'
FINANCIAL INSTRUMENTS	'
	FINANCIAL INSTRUMENTS
	Fair Value Measurements
	We apply recurring fair value measurements to our financial assets and liabilities. In estimating fair value, we generally use a market approach and incorporate assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and/or the risks inherent in the inputs to the valuation techniques. The fair value measurement inputs we use vary from readily observable inputs that represent market data obtained from independent sources to unobservable inputs that reflect our own market assumptions that cannot be validated through external pricing sources. Based on the observability of the inputs used in the valuation techniques, the financial assets and liabilities carried at fair value in the financial statements are classified as follows:
	•	Level 1—Represents unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. This category primarily includes our cash and cash equivalents, accounts receivable and accounts payable.
	•	Level 2—Represents quoted market prices for similar assets or liabilities in active markets, quoted market prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data. This category primarily includes variable rate debt, over-the-counter swap contracts based upon natural gas price indices and interest rate swaps.
	•	Level 3—Represents derivative instruments whose fair value is estimated based on internally developed models and methodologies utilizing significant inputs that are generally less readily observable from market sources. We do not have financial assets and liabilities classified as Level 3.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy must be determined based on the lowest level input that is significant to the fair value measurement. An assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability.
	Derivative Financial Instruments
	Interest Rate Swaps
	We manage a portion of our interest rate risk through interest rate swaps. In March 2012, we terminated an interest rate cap contract and entered into an interest rate swap contract with Wells Fargo, N.A. to reduce the risk associated with the variability of interest rates for our term loan borrowings. The interest rate swap had a notional value of $150.0 million, and a maturity date of June 30, 2014. We received a floating rate based upon one-month LIBOR and paid a fixed rate under the interest rate swap of 0.54%.
	The interest rate swap was designated as a cash flow hedge for accounting purposes at inception of the contract and, thus, to the extent the cash flow hedge was effective, unrealized gains and losses were recorded to accumulated other comprehensive income/(loss) and recognized in interest expense as the underlying hedged transactions (interest payments) were recorded. Any hedge ineffectiveness was recognized in interest expense immediately. We did not have any hedge ineffectiveness during the three and six months ended June 30, 2014 and 2013.
	In February 2014, we discontinued cash flow hedge accounting on a prospective basis, as a result of the $148.5 million temporary repayment of borrowings under our Credit Facility (See Note 10). The fair value of the interest rate swap recorded in accumulated other comprehensive loss at the cash flow hedge de-designation date was $0.1 million. This balance was reclassified into interest expense as interest on the hedged debt was recorded. No ineffectiveness was recorded as a result of the cash flow hedge de-designation. Changes in the fair value of the interest rate swap for the remainder of the contract term were recognized in interest expense.
	In June 2014, we entered into new interest rate swap contracts, which became effective in July 2014, with an aggregate notional value of $140.0 million and a maturity date of June 30, 2015. We receive a floating rate based upon one-month LIBOR and pay a fixed rate of 0.327%. These interest rate swaps are not designated as cash flow hedges and as a result changes in the fair value of the interest rate swaps are recognized immediately in interest expense.
	The fair value of our interest rate swaps is determined based on a discounted cash flow method using the contractual terms of the swaps. The floating coupon rate is based on observable rates consistent with the frequency of the interest cash flows. As of June 30, 2014 and December 31, 2013, the current portion of the interest rate swap liability of $0.2 million and $0.3 million, respectively, was included within other current liabilities. As of June 30, 2014 and December 31, 2013, there was no non-current portion of the interest rate swaps liability.
	The fair values of our interest rate swap liabilities were as follows (in thousands):
		Significant Other Observable Inputs (Level 2)
		Fair value measurement as of
		30-Jun-14			31-Dec-13
	Interest rate swap liabilities	$	180		$	263
	The effect of the interest rate swap designated as a cash flow hedge in our statements of changes in partners’ capital and comprehensive loss was as follows (in thousands):
		Three Months Ended June 30,							Six Months Ended June 30,
		2014			2013				2014				2013
	Change in value recognized in other comprehensive loss - effective portion	$	—		$	40			$	(11	)		$	(30	)
	Loss reclassified from accumulated other comprehensive loss to interest expense	106			100				221				194
	There were no amounts of gains or losses reclassified into earnings as a result of the discontinuance of cash flow hedge accounting due to the lack of probability of the forecasted transaction occurring.
	The amounts recognized in interest expense associated with derivatives that are not designated as hedging instruments were as follows (in thousands):
		Three Months Ended June 30,							Six Months Ended June 30,
		2014			2013				2014				2013
	Realized loss on interest rate derivatives	$	27		$	27			$	53			$	54
	Unrealized loss on interest rate swap derivatives	168			—				180				—
	Commodity Swaps
	In our normal course of business, we periodically enter into month-ahead swap contracts to hedge our exposure to certain intra-month natural gas index pricing risk. The total volume for the outstanding month-ahead swap contracts as of June 30, 2014 and December 31, 2013 was 37,320 MMBtu per day and 33,722 MMBtu per day, respectively. We define these contracts as Level 2 because the index price associated with such contracts is observable and tied to a similarly quoted first-of-the-month natural gas index price. As of December 31, 2013, the fair value of $0.1 million was included within other current assets. As of June 30, 2014, there was no value for commodity swaps included within other current liabilities.
	We have elected to present our commodity swaps net in the balance sheet. We did not have any cash collateral received or paid on our commodity swaps as of June 30, 2014. The effect of offsetting in our balance sheet was as follows (in thousands):
			30-Jun-14							31-Dec-13
			Other Current Assets			Other Current Liabilities				Other Current Assets				Other Current Liabilities
	Gross Amounts of Recognized Assets / (Liabilities)		$	—		$	(12	)		$	140			$	(20	)
	Gross Amounts Offset in the Balance Sheet		—			—				(20		)		20
	Net Amount		$	—		$	(12	)		$	120			$	—
	The realized and unrealized loss on these derivatives, recognized in revenues in our statements of operations, were as follows (in thousands):
		Three Months Ended June 30,							Six Months Ended June 30,
		2014			2013				2014				2013
	Realized gain (loss) on derivatives	$	81		$	(10	)		$	(1,088	)		$	(57	)
	Unrealized loss on derivatives	(175		)	—				(131		)		—

LONGLIVED_ASSETS

LONG-LIVED ASSETS	6 Months Ended
	Jun. 30, 2014
Property, Plant and Equipment [Abstract]	'
LONG-LIVED ASSETS	'
	LONG-LIVED ASSETS
	Property, Plant and Equipment
	Property, plant and equipment consisted of the following (in thousands):
		Estimated	30-Jun-14			31-Dec-13
		Useful Life (yrs)
	Pipelines	30	$	383,041		$	344,721
	Gas processing, treating and other plants	15	260,289			254,133
	Compressors	7	20,459			20,030
	Rights of way and easements	15	24,998			20,729
	Furniture, fixtures and equipment	5	3,576			3,347
	Capital lease vehicles	5-Mar	1,834			1,396
	Total property, plant and equipment		694,197			644,356
	Accumulated depreciation and amortization		(97,323		)	(79,908		)
	Total		596,874			564,448
	Construction in progress		43,314			6,039
	Land and other		22,567			5,308
	Property, plant and equipment, net		$	662,755		$	575,795
	Depreciation is provided using the straight-line method based on the estimated useful life of each asset.
	In January 2013, we shut down our Gregory facility to perform extensive turnaround maintenance activities and to connect additional equipment to enhance NGL recoveries.  As the turnaround maintenance was nearing completion in January 2013, we experienced a fire at this facility.  In connection with the fire, as of June 30, 2014, we have spent approximately $6.1 million to return the facility to service and filed an insurance claim related to these costs.  We have recovered $1.0 million in 2013 and $0.6 million in 2014 from insurance proceeds for this loss and believe it is probable that we will recover the remaining costs, less a $0.3 million deductible, under our insurance policies.
	Intangible Assets
	Intangible assets of $1.5 million and $1.6 million as of June 30, 2014 and 2013, respectively, represent the unamortized value assigned to the long-term supply and gathering contracts acquired in 2011. These intangible assets are amortized on a straight-line basis over the 30-year expected useful lives of the contracts. Amortization expense in the consolidated financial statements presented and over the next five years related to intangible assets for the periods presented is not material.

LONGTERM_DEBT

LONG-TERM DEBT	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
LONG-TERM DEBT	'
	LONG-TERM DEBT
	Credit Facility
	In November 2012, we entered into the Credit Facility, which had a five-year maturity. We could utilize the Credit Facility for working capital requirements and capital expenditures, the purchase of assets, the payment of distributions and other general purposes. In connection with the closing of the purchase of the TexStar Rich Gas System, we re-financed our existing Credit Facility and entered into a new Term Loan Facility (See Note 14 and Note 8). Our outstanding debt and information related to our Credit Facility at June 30, 2014 and December 31, 2013 is as follows (in thousands):
		30-Jun-14			31-Dec-13
	Credit Facility, due November 2017	$	226,850		$	267,300
	Outstanding letters of credit	$	25,930		$	31,260
	Remaining unused borrowings	$	97,220		$	69
	Applicable margin under LIBOR borrowings	2.7		%	4.5		%
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Weighted average interest rate	2.7		%	4.6		%	3.6		%	4.1		%
	Average outstanding borrowings	$	189,993		$	235,191		$	191,567		$	231,184
	Maximum borrowings	$	226,850		$	257,000		$	267,300		$	257,000
	Under our Credit Facility, we had the ability to borrow up to $350.0 million less any letters of credit outstanding. Borrowings under our Credit Facility bear interest at LIBOR plus an applicable margin or a base rate as defined in the respective credit agreements. The fair value of the debt funded through our Credit Facility approximates its carrying amount as of June 30, 2014 and December 31, 2013 due primarily to the variable nature of the interest rate of the instrument.
	Our Credit Facility contained various covenants and restrictive provisions and required maintenance of certain financial and operational compliance covenants. As of June 30, 2014 and December 31, 2013, we were in compliance with all of our loan covenants. All of our assets were pledged as collateral under our Credit Facility. The terms of our Credit Facility contained customary covenants, including those that restrict our ability to make or limit certain payments, distributions, acquisitions, loans, or investments, incur certain indebtedness or create certain liens on our assets, consolidate or enter into mergers, dispose of certain of our assets, engage in certain types of transactions with our affiliates, enter into certain sale/leaseback transactions and modify certain material agreements.
	Amendments to Credit Facility
	During the fourth quarter of 2012 and into the first quarter of 2013, we encountered operational challenges including the January 2013 fire at our Gregory facility and contractual disputes with a former third party processor. These items impacted our operating results adversely and resulted in the need to amend our Credit Facility with the First Amendment and the Second Amendment (each as described below). Due to the benefits from an equity raise during the first quarter of 2014 and improved financial performance, we entered into the Third Amendment and the Fourth Amendment (each as described below), respectively, which reverted certain terms of the Credit Facility back to the original terms.
	First Amendment to Credit Facility
	On March 27, 2013, we entered into the first amendment (the “First Amendment”) to the Credit Facility. As a result of the First Amendment, our available credit was reduced from $350.0 million to the sum of $250.0 million plus any amounts placed on deposit in a collateral account of our General Partner (the “Collateral Account”) and letters of credit outstanding. Amounts on deposit in the Collateral Account were pledged as collateral to the Credit Facility. Pursuant to the First Amendment, we were permitted to pay our quarterly cash distribution of available cash for the first quarter of 2013 regardless of whether we met certain financial covenants for the period ending March 31, 2013. Because the First Amendment did not modify our requirement to meet the financial covenants under the Credit Facility beginning March 31, 2013, and because we believed it was unlikely that we would be in compliance with our financial covenants for the quarter ending March 31, 2013, we further amended our Credit Facility as discussed below.  In connection with the First Amendment, we incurred $0.6 million in fees, which were deferred and are being amortized over the remaining life of the Credit Facility.
	Second Amendment to Credit Facility
	On April 12, 2013, we entered into the limited waiver and second amendment (the “Second Amendment”) to the Credit Facility, which waived our defaults relating to financial covenants in the Credit Facility for the period ended March 31, 2013 and provided more favorable financial covenants until we provided notice under the Credit Facility that we have achieved a consolidated total leverage ratio (the “Target Leverage Ratio”) of 4.25 to 1.00 for one quarter or 4.50 to 1.00 for two consecutive quarters, calculated excluding the benefit of cash on deposit in the Collateral Account and any equity cure amounts (the “Target Leverage Test”). See the Fourth Amendment discussion below regarding the Target Leverage Test. Our available credit, excluding our letters of credit, continued to be subject to the availability limits described in the First Amendment. In connection with the Second Amendment, we incurred $1.5 million in fees, which were deferred and are being amortized over the remaining life of the Credit Facility.
	The Second Amendment provided for, among other things, the following:
	•	established our letters of credit sublimit at $50.0 million;
	•	until we achieved the Target Leverage Ratio:
	•	an increase in our interest rate to LIBOR plus 4.50%;
	•	a limit to our growth capital expenditures of $25.0 million for the last three quarters of 2013 and an additional $25.0 million for the subsequent 18-months ending June 30, 2015 (provided that if additional cash, as required under the Second Amendment, is placed in the Collateral Account, such expenditures could have been increased to $28.0 million for the remaining three quarters of 2013 and the subsequent 18-months ending June 30, 2015);
	•	distributions to our unitholders were effectively limited to our established minimum quarterly distribution of $0.40 per unit; and
	•	our ability to make acquisitions was limited; and
	•	once we achieved the Target Leverage Ratio, we had the option to revert certain provisions of the Credit Facility back to the terms of our original Credit Facility (See Fourth Amendment to Credit Facility below).
	Third Amendment to Credit Facility
	On January 29, 2014, we entered into the Third Amendment (the “Third Amendment”) to our Credit Facility.
	Pursuant to the Third Amendment, we were able to (a) acquire a specified target entity or its assets, provided that, among other things, the aggregate consideration paid by us in connection with such acquisition did not exceed $40.0 million and (b) make certain capital expenditures with respect to the addition to our pipeline systems into Webb County, Texas (the “Webb Pipeline”).
	In addition, the Third Amendment decreased our Maximum Adjusted Consolidated Total Leverage Ratio (as defined in our Credit Facility) to 5.75 to 1.00 for the March 31, 2014 calculation period when we (a) received net cash proceeds in a specified amount pursuant to permitted equity offerings and (b) initiated construction of the Webb Pipeline in accordance with the terms of our Credit Facility. In connection with the Third Amendment, we incurred $0.1 million in fees, which were deferred and are being amortized over the remaining life of the Credit Facility.
	Fourth Amendment to Credit Facility
	On March 13, 2014, we entered into the Fourth Amendment (the “Fourth Amendment”) to the Credit Facility. Concurrently with the Fourth Amendment becoming effective, we exercised the Target Leverage Option established pursuant to the Second Amendment and satisfied a leverage ratio of less than 4.25 to 1.00 calculated on a pro forma basis for the debt outstanding, after the net proceeds from the equity issuance were used to pay off debt, and utilizing the Adjusted EBITDA, as provided in the Fourth Amendment, for the period ended December 31, 2013. An effect of us exercising the Target Leverage Option was the removal of the $250.0 million availability limit as provided for in the First Amendment and returning the availability under the Credit Facility to its original $350.0 million, less any letters of credit outstanding.
	Pursuant to the Fourth Amendment, all funds previously deposited in the Collateral Account were released from the liens and security interests and are no longer pledged as collateral securing our obligations under the Credit Facility.
	As a result of the Fourth Amendment and our exercise of the Target Leverage Option, certain other provisions of the Credit Facility reverted to the requirements and terms in effect before the Second Amendment. The effects of such reversion are that, among other things, (a) the Applicable Margin has been reset to the current applicable level in the pricing grid based on our pro forma Consolidated Total Leverage (as defined in our Credit Facility) immediately upon closing of the Fourth Amendment, (b) the $25.0 million limit on growth capital expenditures for the 18-month period ending June 30, 2015 is no longer effective and (c) certain limitations on unit distributions imposed by the Second Amendment are no longer effective. In connection with the Fourth Amendment, we incurred $0.1 million in fees, which were deferred and are being amortized over the remaining life of the Credit Facility.
	Concurrently with the Fourth Amendment and as a result of our acquisition in March 2014, our maximum consolidated total leverage ratio was increased to 5.00 to 1.00 through September 30, 2014.
	The Credit Facility contained various covenants and restrictive provisions and also required maintenance of certain financial and operational covenants including but not limited to the following:
	•	beginning October 1, 2014 and prior to exercising a one-time covenant election in connection with the issuance of certain unsecured notes, a consolidated total leverage ratio (generally defined as debt to EBITDA, as adjusted) of not more than 4.50 to 1.00, and a consolidated interest coverage ratio of not less than 2.50 to 1.00. The requirement to maintain a certain consolidated total leverage ratio was subject to a provision for increases to 5.00 to 1.00 in connection with certain acquisitions; and
	•	upon exercising a one-time covenant election in connection with the issuance of certain unsecured notes, a consolidated total leverage ratio of not more than 5.25 to 1.00, a consolidated senior secured leverage ratio of not more than 3.50 to 1.00 and a consolidated interest coverage ratio of not less than 2.50 to 1.00.
	As a result of the combination of Southcross Energy LLC and TexStar, on August 4, 2014 we entered into new debt arrangements. See Note 14 for additional details.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	Legal Matters
	On March 5, 2013, one of our subsidiaries filed suit against Formosa Hydrocarbons Company, Inc. (“Formosa”).  The lawsuit seeks recoveries of losses that we believe our subsidiary experienced as a result of the failure of Formosa to perform certain of its obligations under the gas processing and sales contract between the parties.  Formosa filed a response generally denying our claims and filed counterclaims against our subsidiary claiming our affiliate breached the gas processing and sales contract, defrauded Formosa in connection with the alleged breach and breached a related agreement between the parties for the supply by Formosa of residue gas to a third party on behalf of our subsidiary. We believe the counterclaims are without merit and our subsidiary will defend itself vigorously against the counterclaims while continuing to pursue its own claims. We cannot predict the outcome of such litigation or the timing of any related recoveries or payments.
	From time to time, we are party to certain legal or administrative proceedings that arise in the ordinary course and are incidental to our business. There currently are no such pending proceedings to which we are a party that our management believes will have a material adverse effect on our results of operations, cash flows or financial condition. However, future events or circumstances, currently unknown to management, will determine whether the resolution of any litigation or claims ultimately will have a material effect on our results of operations, cash flows or financial condition in any future reporting periods.
	Regulatory Compliance
	In the ordinary course of our business, we are subject to various laws and regulations. In the opinion of our management, compliance with current laws and regulations will not have a material effect on our results of operations, cash flows or financial condition.
	Leases
	Capital Leases
	We have auto leases classified as capital leases that are recorded in other current liabilities and other non-current liabilities in our consolidated balance sheet as of June 30, 2014. The lease termination dates of the agreements vary from 2014 until 2018. We recorded amortization expense related to the capital leases of $0.1 million and $0.3 million for the three and six months ended June 30, 2014, respectively. We recorded amortization expense related to the capital lease of $0.1 million and $0.2 million for the three and six months ended June 30, 2013, respectively.
	Capital leases entered into during the three and six months ended June 30, 2014 were $0.1 million and $0.5 million, respectively. Capital leases entered into during the three and six months ended June 30, 2013 were $0.1 million and $1.2 million, respectively.
	Operating Leases
	We maintain operating leases in the ordinary course of business.  These leases include those for office and other operating facilities and equipment.  The lease termination dates of the agreements vary from 2014 to 2025.  Expenses associated with operating leases were $0.4 million and $0.7 million for the three and six months ended June 30, 2014, respectively. Expenses associated with operating leases were $0.3 million and $0.8 million for the three and six months ended June 30, 2013, respectively.
	Purchase Commitments
	On June 30, 2014, we had commitments of approximately $19.4 million for purchases of material and equipment related to our capital projects, primarily our Webb Pipeline project. We have other planned capital projects that are discretionary in nature, with no substantial contractual capital commitments made in advance of the actual expenditures.

TRANSACTIONS_WITH_RELATED_PART

TRANSACTIONS WITH RELATED PARTIES	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
TRANSACTIONS WITH RELATED PARTIES	'
	TRANSACTIONS WITH RELATED PARTIES
	Charlesbank
	As of June 30, 2014, the board of directors of our General Partner includes three persons affiliated with Charlesbank and three outside directors. All of these directors are compensated equally for similar responsibilities and reimbursed for expenses incurred for their services to us. For the three and six months ended June 30, 2014, we paid fees related to the Charlesbank director services of $0.1 million and $0.2 million, respectively, which are reflected in general and administrative expenses in our consolidated statements of operations. For the three and six months ended June 30, 2013, we paid fees related to the Charlesbank director services of $0.1 million and $0.3 million, respectively, which are reflected in general and administrative expenses in our consolidated statements of operations. As a result of the combination of Southcross Energy LLC and TexStar on August 4, 2014, there have been changes to the board of directors of our General Partner. See Note 14 for additional details.
	Southcross Energy Partners GP, LLC (our General Partner)
	Our General Partner does not receive a management fee or other compensation for its management of us.  However, our General Partner and its affiliates are entitled to reimbursements for all expenses incurred on our behalf, including, among other items, compensation expense for all employees required to manage and operate our business.  During the three and six months ended June 30, 2014, we incurred expenses of $7.7 million and $15.1 million, respectively, related to these reimbursements, which are reflected in operating and general and administrative expenses in our consolidated statements of operations. During the three and six months ended June 30, 2013, we incurred expenses of $6.2 million and $12.1 million, respectively, related to these reimbursements, which are reflected in operating and general and administrative expenses in our consolidated statements of operations.
	The reimbursement of our compensation expenses to our General Partner is in accordance with our Partnership Agreement. Compensation expense for services incurred by us as of June 30, 2014 on behalf of Southcross Energy LLC were billed to Southcross Energy LLC. For the three and six months ended June 30, 2014, compensation expense of $0.3 million was billed to Southcross Energy LLC, which was not incurred on our behalf.
	During the second quarter of 2013, we entered into a Purchase Agreement (as defined below) with Southcross Energy LLC, pursuant to which we issued and sold 1,715,000 Series A Preferred Units to Southcross Energy LLC for a cash purchase price of $22.86 per Series A Preferred Unit, in a privately negotiated transaction (See Note 9).  After the Series A Preferred Units issuance during the second quarter of 2013, Southcross Energy LLC sold 1,500,000 of the units to third parties. All of the Series A Preferred Units, including those held by Southcross Energy LLC, were converted into common units on August 4, 2014. See Note 14.
	Wells Fargo Bank, N.A.
	During the first quarter of 2014, we entered into amendments to our Credit Facility with syndicates of financial institutions and other lenders. These syndicates included affiliates of Wells Fargo Bank, N.A., an affiliate of which is a member of the investor group (See Note 6). Affiliates of Wells Fargo Bank, N.A. have from time to time engaged in commercial banking and financial advisory transactions with us in the normal course of business. Total fees paid, excluding interest, to Wells Fargo Bank, N.A. and its affiliates were $0.2 million during the first quarter of 2014 relating to the Third Amendment and Fourth Amendment of the Credit Facility. During the three and six months ended June 30, 2013, we incurred costs of $1.4 million and $2.0 million, respectively, to Wells Fargo Bank, N.A. and its affiliates. In connection with the closing we refinanced our Credit Facility and entered into a new Term Loan Facility. See Note 14.

SERIES_A_PREFERRED_UNITS

SERIES A PREFERRED UNITS	6 Months Ended
	Jun. 30, 2014
Preferred Units Description and Other Disclosures [Abstract]	'
SERIES A PREFERRED UNITS	'
	SERIES A PREFERRED UNITS
	We entered into a Series A Convertible Preferred Unit Purchase Agreement (the “Purchase Agreement”) with Southcross Energy LLC, pursuant to which we issued and sold 1,715,000 Series A Preferred Units to Southcross Energy LLC during the second quarter of 2013 for a cash purchase price of $22.86 per unit, in a privately negotiated transaction (the “Private Placement”). Southcross Energy LLC sold 1,500,000 of these Series A Preferred Units to third parties during the second quarter of 2013.
	Our total capital infusion of $40.0 million, from all sales of Series A Preferred Units and General Partner capital contributions, was used to reduce borrowings under our Credit Facility (See Note 6). The Private Placement resulted in proceeds to us of $39.2 million. We also received a $0.8 million capital contribution from our General Partner to maintain its 2.0% general partner interest in us.
	Applicable accounting guidance related to the Series A Preferred Units requires that equity instruments with redemption features that are redeemable at the option of the holder be classified outside of permanent equity.  The change of control rights associated with the Series A Preferred Units requires the units to be classified outside of permanent equity.  The Series A Preferred Units were adjusted to maximum redemption value as of June 30, 2014 because the maximum redemption value is currently different than the fair value of the units at issuance.  The adjustment in the valuation adjustment to issuance value and the distributions associated with the Series A Preferred Units of $5.8 million have been included in the calculation of partners’ capital and earnings per unit for the three months ended June 30, 2014.  The adjustment in the valuation adjustment to issuance value and the distributions associated with the Series A Preferred Units of $6.3 million have been included in the calculation of partners’ capital and earnings per unit for the six months ended June 30, 2014.  Additionally, none of the identified embedded derivatives relating to the terms of the Series A Preferred Units require bifurcation, as each embedded derivative was determined to be clearly and closely related to the host contract. All of the Series A Preferred Units, including the units held by Southcross Energy LLC, were converted into common units on August 4, 2014. See Note 14.
	Voting Rights: The Series A Preferred Units were a class of voting equity security that ranks senior to all of our other classes or series of equity securities with respect to distribution rights and rights upon liquidation.  The Series A Preferred Units had voting rights identical to the voting rights of the common units and vote with the common units as a single class, such that each Series A Preferred Unit (including each Series A Preferred Unit issued as an in-kind distribution, discussed below) is entitled to one vote for each common unit into which such Series A Preferred Unit is convertible on each matter with respect to which each common unit is entitled to vote.
	Distribution Rights: Holders of Series A Preferred Units were entitled to quarterly distributions of in-kind Series A Preferred Units for the first four full quarters following the issue date of those units and continuing thereafter until the board of directors of our General Partner determines to begin paying quarterly distributions in cash, and thereafter in cash. In-kind distributions will be in the form of Series A Preferred Units at a rate of $0.40 per outstanding Series A Preferred Unit per quarter (or 7% per year of the per unit purchase price) or, beginning after four full quarters, such higher per unit rate as is paid in respect of our common units. Cash distributions will equal the greater of $0.40 per unit per quarter or the quarterly distribution paid with respect to each common unit.
	Conversion Rights: The Series A Preferred Units are convertible into common units based on an exchange ratio of 110.0% of the Series A Preferred Units if a third party acquires majority ownership control of our General Partner or we sell substantially all of our assets, in either case before January 1, 2015. In connection with the combination of Southcross Energy LLC and TexStar (see Note 14 for details), all holders of the Series A Preferred Units elected to convert their Series A Preferred Units into 2,015,638 common units based on the 110.0% exchange ratio.
	Dissolution and Liquidation: The Series A Preferred Units were senior to our common units with respect to rights on dissolution and liquidation. Common units issued upon conversion of Series A Preferred Units will rank equally with the rest of our common units with respect to rights on dissolution and liquidation.

PARTNERS_CAPITAL

PARTNERS' CAPITAL	6 Months Ended
	Jun. 30, 2014
Partners' Capital Notes [Abstract]	'
PARTNERS' CAPITAL	'
	PARTNERS’ CAPITAL
	Common Units
	In February 2014, we completed a public equity offering of 9,200,000 additional common units for $144.7 million, net of expenses, and received a capital contribution from our General Partner to maintain its 2.0% interest in us. The net proceeds from the offering are being used to fund the construction of our Webb Pipeline, were used for our acquisition in March 2014 and are being used for general partnership purposes. We temporarily repaid borrowings under our Credit Facility during the first quarter of 2014, which we are redrawing to fund the construction of the new pipeline and for other general purposes.
	Our common units represent limited partner interests in us. The holders of our common units are entitled to participate in partnership distributions and are entitled to exercise the rights and privileges available to limited partners under our Partnership Agreement. We had 21,465,046 and 12,253,985 common units issued and outstanding as of June 30, 2014 and December 31, 2013, respectively. In connection with the acquisition of the TexStar Rich Gas System and the combination of Southcross Energy LLC and TexStar on August 4, 2014, we issued Class B Convertible units, accelerated the vesting of the LTIP units (See Note 11), and all of the holders of the Series A Preferred Units elected to convert their Series A Preferred Units into common units based on an exchange ratio of 110.0%. See Note 14 for additional details.
	Subordinated Units
	Subordinated units represent limited partner interests in us and convert to common units at the end of the subordination period (as defined in our Partnership Agreement). The principal difference between our common units and our subordinated units is that in any quarter during the subordination period, holders of the subordinated units are not entitled to receive any distribution of available cash until the common units have received the minimum quarterly distribution plus any arrearages in the payment of the minimum quarterly distribution from prior quarters. Subordinated units do not accrue arrearages. We had 12,213,713 subordinated units issued and outstanding as of June 30, 2014 and December 31, 2013. Beginning with the third quarter of 2014, until such time we have a Distributable Cash Flow Ratio of at least 1.0, the holder of the subordinated units has waived the right to receive distributions on any subordinated units that would cause the Distributable Cash Flow Ratio to be less than 1.0.
	General Partner Interests
	Our general partner interest consisted of 724,495 general partner units as of June 30, 2014 and 534,638 general partner units as of December 31, 2013. In connection with other equity issuances including issuances related to the acquisition of the TexStar Rich Gas System and the combination of Southcross Energy LLC and TexStar, our General Partner has made capital contributions in exchange for an issuance of additional general partner units to maintain its 2.0% ownership interest in us. Also, the General Partner has received general partner unit PIK distributions from the general partner units purchased in connection with the Private Placement (See Note 3).

INCENTIVE_COMPENSATION

INCENTIVE COMPENSATION	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
INCENTIVE COMPENSATION	'
	INCENTIVE COMPENSATION
	Unit Based Compensation
	Long-Term Incentive Plan
	On November 7, 2012, and in connection with our initial public offering, we established our 2012 Long-Term Incentive Plan (“LTIP”), which provides incentive awards to eligible officers, employees and directors of our General Partner. Awards granted to employees under the LTIP vest over a three-year period in equal annual installments in either a common unit or an amount of cash equal to the fair market value of a common unit at the time of vesting, as determined by management at its discretion. These awards also include distribution equivalent rights that grant the holder the right to receive an amount equal to the cash distributions on common units during the period the award remains outstanding.
	The following table summarizes information regarding awards of units granted under the LTIP:
		Units		Weighted-average fair
				value at grant date
	Unvested - December 31, 2013	182,673		$	22.55
	Granted units	315,721		17.1
	Forfeited units	(200	)	23.01
	Units recaptured for tax withholdings	(2,108	)	19.97
	Vested units	(5,292	)	19.95
	Unvested - June 30, 2014	490,794		$	19.43
	For the six months ended June 30, 2014 and 2013, we granted awards under the LTIP with a grant date fair value of $5.4 million and $0.7 million, respectively, which we have classified as equity awards. As of June 30, 2014 and June 30, 2013, we had total unamortized compensation expense of $7.5 million and $3.0 million, respectively, related to these awards. The awards were expected to be amortized over a three-year vesting period from each equity awards’ grant date. The combination of Southcross Energy LLC and TexStar on August 4, 2014 resulted in a change of control of our General Partner and accelerated the vesting of all the LTIP awards outstanding on that date. As of June 30, 2014 and June 30, 2013, we had 1,213,642 and 1,579,621 units, respectively, available for issuance under the LTIP.
	Unit Based Compensation Expense
	The following table summarizes information regarding recognized compensation expense, which is included in general and administrative expense on our consolidated statements of operations (in thousands):
		Three Months Ended June 30,					Six Months Ended June 30,
		2014			2013		2014		2013
	Unit-based compensation	$	1,082		$	685	$	1,611	$	1,093
	Employee Savings Plan
	We have employee savings plans under Sections 401(a) and 401(k) of the Internal Revenue Code ("IRC") whereby employees of our General Partner may contribute a portion of their base compensation to the employee savings plan, subject to limits under the IRC. We provide a matching contribution each payroll period equal to 100% of the employee's contribution up to the lesser of 6% of the employee's pay or $17,500 annually for the period. The following table summarizes information regarding contributions and the expense recognized for the matching contributions, which is included in general and administrative expense on our consolidated statements of operations (in thousands):
		Three Months Ended June 30,					Six Months Ended June 30,
		2014			2013		2014		2013
	Matching contributions expensed for employee savings plan	$	234		$	161	$	590	$	310

REVENUES

REVENUES	6 Months Ended
	Jun. 30, 2014
Revenues [Abstract]	'
REVENUES	'
	REVENUES
	We had revenues consisting of the following categories (in thousands):
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Sales of natural gas	$	123,401	$	106,552	$	268,759	$	204,861
	Sales of NGLs and condensate	54,282		33,792		106,155		66,212
	Transportation, gathering and processing fees	17,279		14,175		33,394		27,520
	Other	101		184		346		361
	Total revenues	$	195,063	$	154,703	$	408,654	$	298,954

CONCENTRATION_OF_CREDIT_RISK_A

CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE	6 Months Ended
	Jun. 30, 2014
Risks and Uncertainties [Abstract]	'
CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE	'
	CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE
	Our primary markets are in South Texas, Alabama and Mississippi. We have a concentration of revenues and trade accounts receivable due from customers engaged in the production, trading, distribution and marketing of natural gas and NGL products. These concentrations of customers may affect overall credit risk in that these customers may be affected similarly by changes in economic, regulatory or other factors. We analyze our customers’ historical financial and operational information before extending credit.
	Our top ten customers for the three and six months ended June 30, 2014 and 2013 represent the following percentages of consolidated revenue:
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Top ten customers	73	%	57.7	%	68.6	%	59.6	%
	The percentage of total consolidated revenue for each customer that exceeded 10% of total revenues for the three and six months ended June 30, 2014 and 2013 was as follows:
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Trafigura AG	13	%	(a)		12.6	%	(a)
	Sherwin Alumina Company	12.2	%	12.9	%	11	%	12.5	%
	Dow Hydrocarbons & Resources LLC	(a)		10.9	%	(a)		(a)
	Formosa Hydrocarbons Co., Inc.	(a),(b)		(a),(b)		(a),(b)		12.3	%
	(a) Information is not provided for periods for which the customer or producer was less than 10% of our consolidated revenue.
	(b) Our contract with Formosa terminated on June 1, 2013.
	For the six months ended June 30, 2014 and 2013, we did not experience significant non-payment for services. At June 30, 2014, we did not record an allowance for uncollectible accounts receivable.

SUBSEQUENT_EVENTS

SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
SUBSEQUENT EVENTS	'
	SUBSEQUENT EVENTS
	Partnership Distribution
	On July 25, 2014, the Board of Directors of our General Partner (the “Board”) declared a cash distribution of $0.40 per common unit, subordinated unit and General Partner unit, which will be paid on August 14, 2014 to unitholders of record on August 8, 2014.
	Acquisition of the TexStar Rich Gas System
	On August 4, 2014, we acquired the TexStar Rich Gas System through a contribution of TexStar’s equity interest in the entities that own the TexStar Rich Gas System (the “Contribution”) to us. In exchange for the Contribution, we paid $80 million in cash, assumed $100 million of debt (which was immediately repaid through our new term loan agreement) and issued 14,633,000 of our newly-established Class B Convertible Units (the “Class B Convertible Units”). The TexStar Rich Gas System consists of a cryogenic processing plant, located in Bee County, Texas, and rich natural gas gathering and residue pipelines across the core producing areas extending from Dimmit to Karnes Counties in the liquids-rich window of the Eagle Ford shale. These pipelines are operated under a split-capacity joint venture with Atlas Pipeline Partners LP.
	Class B Convertible Units Payment-in-kind
	To establish the Class B Convertible Units, on August 4, 2014 we amended and restated our agreement of limited partnership and entered into a Third Amended and Restated Agreement of Limited Partnership (as amended and restated, the “Third A&R Partnership Agreement”). The Class B Convertible Units consist of 14,633,000 of such units plus any additional Class B Convertible Units issued in kind as a distribution (“Class B PIK Units”). The Class B Convertible Units have the same rights, preferences and privileges, and are subject to the same duties and obligations, as our common units, with certain exceptions as noted below.
	The Third A&R Partnership Agreement does not allow additional Class B Convertible Units (other than Class B PIK Units and the 14,633,000 Class B Convertible Units issued in connection with the Contribution) to be issued without the prior approval of our General Partner and the holders of a majority of the outstanding Class B Convertible Units.
	The Third A&R Partnership Agreement provides that we will procure the listing of the common units issuable upon conversion of the Class B Convertible Units on the New York Stock Exchange or other applicable national securities exchange.
	Distributions
	Commencing with the quarter ending September 30, 2014 and until converted, as long as certain requirements are met, the holders of the Class B Convertible Units will receive quarterly distributions in an amount equal to $0.3257 per unit. These distributions will be paid quarterly in Class B PIK Units within 45 days after the end of each quarter. Our General Partner was entitled, and has exercised its right, to retain its 2.0% general partner interest in us in connection with the original issuance of Class B Convertible Units. In connection with future distributions of Class B PIK Units, the General Partner is entitled to a corresponding distribution to maintain its 2.0% general partner interest in us.
	Conversion
	The Class B Convertible Units are convertible into common units on a one-for-one basis and, once converted, will participate in cash distributions pari passu with all other common units. The conversion of Class B Convertible Units will occur on the date we (a) make a quarterly distribution equal to or greater than $0.44 per common unit, (b) generate Distributable Cash Flow (as defined in the Third A&R Partnership Agreement) in an amount sufficient to pay, and actually pay, the declared distribution on all units for the two quarters immediately preceding the date of conversion (the “measurement period”) and (c) forecast paying a distribution equal to or greater than $0.44 per unit from forecasted Class B Distributable Cash Flow on all outstanding common units for the two quarters immediately following the measurement period.
	Voting
	The Class B Convertible Units generally have the same voting rights as common units, and will have one vote for each common unit into which such units are convertible.
	Consummation of Combination Transactions
	Contemporaneously with the consummation of the Contribution, Southcross Energy LLC (“Southcross Energy”), which previously owned a significant stake in our outstanding units and 100% of our General Partner, completed its previously disclosed combination with TexStar (the “Combination Transactions”).
	As a result of the Combination Transactions, Southcross Holdings LP (“Southcross Holdings”), through Southcross Holdings Borrower LP, a wholly owned subsidiary of Southcross Holdings (“Southcross Borrower”), acquired from (a) BBTS Borrower LP (“BBTS”) 100% of TexStar and its general partner and (b) from Southcross Energy LLC 2,116,400 of our common units and 12,213,713 of our subordinated units, collectively representing an approximate 39.8% limited partner interest in us, as well as 100% of our General Partner, which owns an approximate 2.0% interest in us and our incentive distribution rights. BBTS was controlled by EIG Global Energy Partners and Tailwater Capital, and Southcross Energy LLC was controlled by Charlesbank Partners. The Contribution Transactions resulted in Charlesbank Capital Partners, EIG Global Energy Partners and Tailwater Capital (collectively, the “Sponsors”) each indirectly owning approximately one-third of Southcross Holdings.
	Board of Directors
	The Board will continue to be comprised of seven directors. As a result of the Contribution Transactions, BBTS will have the right to designate four directors (two of whom must be independent) and Southcross Energy LLC will have the right to designate two directors (one of whom must be independent). The seventh member of the Board and its chairman will be selected by a majority of the other directors. David W. Biegler has been designated as the chairman of the Board for two years or until his earlier death or resignation.
	In connection with the closing of the Contribution Transactions, on August 4, 2014, Samuel P. Bartlett and Kim G. Davis resigned as directors of our General Partner, and Wallace Henderson and Jason Downie, as designees of BBTS, were elected as directors of our General Partner. Messrs. Bartlett and Davis did not resign as the result of any disagreement with us or our General Partner.
	Conversion of Series A Preferred Units into common units
	Pursuant to the change in control provision in our Second Amended and Restated Agreement of Limited Partnership applicable to our Series A Preferred Units, all of the holders of the Series A Preferred Units elected to convert their Series A Preferred Units into common units based on an exchange ratio of 110.0%.
	New Debt Arrangements
	On August 4, 2014, in connection with the consummation of the Contribution, we entered into (a) a Third Amended and Restated Revolving Credit Agreement with Wells Fargo Bank, N.A., as Administrative Agent, UBS Securities LLC and Barclays Bank PLC, as Co-Syndication Agents, JPMorgan Chase Bank, N.A., as Documentation Agent, and a syndicate of lenders (the “Third A&R Credit Agreement”) and (b) a Term Loan Credit Agreement with Wells Fargo Bank, N.A., as Administrative Agent, UBS Securities LLC and Barclays Bank PLC, as Co-Syndication Agents, and a syndicate of lenders (the “Term Loan Agreement” and, together with the Third A&R Credit Agreement, the “Senior Credit Facilities”).
	The initial borrowings and extensions of credit under the Term Loan Agreement were used to finance the acquisition of the TexStar Rich Gas System (including the immediate repayment of the $100 million of debt assumed in the transaction), the repayment of certain of our existing debt and the payment of fees and expenses in connection with the new debt arrangements and ongoing working capital and other general partnership purposes. No amounts were initially drawn on the Third A&R Credit Agreement. Substantially all of our assets are pledged as collateral under the Senior Credit Facilities, with the security interest of the facilities ranking pari passu.
	Third A&R Credit Agreement
	The Third A&R Credit Agreement is a five-year $200 million revolving credit facility. Pursuant to the Third A&R Credit Agreement, among other things:
	(a)	the letters of credit sublimit is increased to $75 million;
	(b)	we are given the right to increase the total commitments under the credit facility by obtaining additional commitments from other lenders, as long as our senior secured leverage ratio is less than or equal to 4.50 to 1.00 before and after giving effect to such increase, subject to certain other conditions;
	(c)	the definition of “Change of Control” is amended to permit the combination transaction with TexStar and to reflect the Sponsors’ control of the General Partner;
	(d)	our maximum consolidated total leverage ratio is set at (i) 5.75 to 1.00 as of the last day of the fiscal quarter ending each of September 30, 2014 and December 31, 2014, (ii) 5.50 to 1.00 as of the last day of the fiscal quarter ending March 31, 2015, (iii) 5.25 to 1.00 as of the last day of the fiscal quarter ending June 30, 2015 and (iv) 5.00 to 1.00 as of the last day of each fiscal quarter thereafter, in each case without any step-ups in connection with acquisitions;
	(e)	we have the right, exercisable on or before the date that our annual audited financial statements are due for the 2014 fiscal year, to comply with the consolidated total leverage ratio, consolidated senior secured leverage ratio and the consolidated interest coverage ratio covenants (the “Financial Covenants”) by applying certain specified quarterly base periods pertaining to the TexStar Rich Gas System;
	(f)	if we fail to comply with the Financial Covenants (a “Financial Covenant Default”), we have the right (which cannot be exercised more than two times in any 12-month period or more than four times during the term of the facility) to cure such Financial Covenant Default by having the Sponsors purchase equity interests in or make capital contributions to us resulting in, among other things, proceeds that, if added to the minimum financial requirements, would result in us satisfying the Financial Covenants;
	(g)	certain definitions are amended to take into account the TexStar Rich Gas System; and
	(h)	the negative covenants are amended to permit the entry into, and indebtedness under, the Term Loan Agreement.
	Term Loan Agreement
	The Term Loan Agreement is a seven-year $450 million senior secured term loan facility. On August 4, 2014, the lenders funded the full amount of the facility. Under the Term Loan Agreement, among other things:
	(a)	subject to certain requirements, including the absence of a default and pro forma compliance under the Third A&R Credit Agreement and pro forma compliance with a senior secured leverage ratio less than or equal to 4.50 to 1.00 before and after giving effect to such increase, we may from time to time request incremental term loan commitments subject to certain other conditions;
	(b)	we may seek commitments from third party lenders in connection with any incremental term loan commitment requests, subject to certain consent rights given to the administrative agent;
	(c)	the guarantors and the collateral are the same as provided for the benefits of lenders in the Third A&R Credit Agreement;
	(d)	subject to certain conditions, we may request that the lenders extend the seven-year maturity of all or partially all of the outstanding loans under the facility;
	(e)	the facility will amortize in equal quarterly installments in an aggregate annual mount equal to 1% of the original principal amount of the initial loan, with the remainder due on the maturity date;
	(f)	there are customary mandatory prepayment provisions and, subject to certain conditions, permissive prepayment provisions; provided, that if certain repricing transactions occur, we must pay a call premium equal to 1% of the principal amount of the loans subject to the repricing transactions; and
	(g)	there are customary representations and warranties, affirmative covenants, negative covenants and provisions governing an event of default (including acceleration of payment in connection with material indebtedness, including the Third A&R Credit Agreement).
	2014 Equity Incentive Plan
	On August 4, 2014, our General Partner and Southcross GP Management Holdings, LLC, a newly formed entity of which Southross Holdings is the sole managing member (“GP Management”), adopted the Southcross Energy Partners GP, LLC and Southcross GP Management Holdings, LLC 2014 Equity Incentive Plan (the “2014 Incentive Plan”). Under the 2014 Incentive Plan, employees, consultants and directors of our General Partner and GP Management will be eligible to receive incentive compensation awards.
	The 2014 Incentive Plan generally provides for the grant of awards, from time to time at the discretion of the Board (and, as applicable, the board of directors of the general partner of Southcross Holdings), of non-voting units in our General Partner to GP Management and then a corresponding grant or award of non-voting units of GP Management to the employee, consultant or director.
	In connection with the adoption of the 2014 Incentive Plan, our General Partner amended and restated its limited liability company agreement and entered into its Second Amended and Restated Limited Liability Company Agreement (as amended and restated, the “A&R LLC Agreement”). The A&R LLC Agreement establishes a new class of non-voting units for issuance pursuant to the 2014 Incentive Plan and designates Southcross Holdings as our General Partner’s managing member.

SUPPLEMENTAL_INFORMATION

SUPPLEMENTAL INFORMATION	6 Months Ended
	Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
SUPPLEMENTAL INFORMATION	'
	SUPPLEMENTAL INFORMATION
	Supplemental Cash Flow Information (in thousands)
		Six Months Ended June 30,
		2014			2013
	Supplemental Disclosures:
	Cash paid for interest, net of amounts capitalized	$	4,200		$	5,703
	Cash received for tax refunds	185			87
	Supplemental schedule of non-cash investing and financing activities:
	Accounts payable related to capital expenditures	9,656			29,288
	Change in value recognized in other comprehensive income	11			30
	Capital lease obligation	466			(1,240		)
	Accrued distribution equivalent rights (DERs) on the LTIP units	259			100
	Series A convertible preferred unit in-kind distribution and fair value adjustment	6,301			5,226
	Other	1,688			—
	Capitalization of Interest Cost
	We capitalize interest on projects during their construction period. Once a project is placed in service, capitalized interest, as a component of the total cost of the construction, is depreciated over the estimated useful life of the asset constructed.
	We incurred the following interest costs (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Total interest costs	$	2,225		$	3,501		$	5,297		$	6,148
	Capitalized interest included in property, plant and equipment, net	(454		)	(400		)	(553		)	(1,000		)
	Interest expense	$	1,771		$	3,101		$	4,744		$	5,148
	Deferred Financing Costs
	Deferred financing costs are capitalized and amortized as interest expense under the effective interest method over the term of the related debt. The unamortized balance of deferred financing costs is included in other assets on the consolidated balance sheets. Changes in deferred financing costs are as follows (in thousands):
		2014
	Deferred financing costs, January 1	$	5,237
	Capitalization of deferred financing costs (1)	166
	Less:
	Amortization of deferred financing costs	(675		)
	Deferred financing costs, June 30	$	4,728
	___________________________________________________________________________
	(1) See Note 6.
	Southcross Assets Considered Leases to Third Parties
	On March 6, 2014, we acquired natural gas pipelines and contracts related to these pipelines (See Note 2). The pipelines transport natural gas to two power plants in Nueces County, Texas under fixed-fee contracts. The contracts have a primary term through 2029 and an option to extend the agreements by an additional term of up to ten years. These contracts are considered operating leases under the applicable accounting guidance.
	Future minimum annual demand payment receipts under these agreements as of June 30, 2014, respectively, were as follows: $2.2 million in 2014 of which a portion was paid prior to our acquisition, $5.6 million in 2015, $5.6 million in 2016, $5.6 million in 2017, $2.2 million in 2018, $2.2 million in 2019 and $15.3 million thereafter. The revenue recognized for the demand payments is recognized on a straight-line basis over the term of the contract. The demand fee revenues under the contracts were $0.7 million and $0.9 million for the three and six months ended June 30, 2014 and have been included within transportation, gathering and processing fees within Note 12. The amounts do not include contingent fees based on the actual gas volumes delivered under the contracts. Contingent fees were $0.3 million and 0.4 million for the three and six months ended June 30, 2014.

BASIS_OF_PRESENTATION_AND_SUMM1

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	We prepared this Quarterly Report on Form 10-Q under the rules and regulations of the Securities and Exchange Commission and in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial statements. Accordingly, these condensed consolidated financial statements do not include all of the disclosures required by GAAP and should be read with our 2013 Annual Report on Form 10-K. The condensed consolidated financial statements as of June 30, 2014 and December 31, 2013, and for the three and six months ended June 30, 2014 and 2013, are unaudited and have been prepared on the same basis as the audited financial statements included in our 2013 Annual Report on Form 10-K.  All intercompany accounts and transactions have been eliminated in the preparation of the accompanying condensed consolidated financial statements. The condensed consolidated financial statements reflect the assets acquired and liabilities assumed as of June 30, 2014 and the operating results for the period from March 6, 2014 through June 30, 2014 associated with the acquisition discussed further in Note 2. Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included herein.
	The accompanying unaudited condensed consolidated financial statements were prepared in conformity with GAAP, which requires management to make various estimates and assumptions that may affect the amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Actual results may differ from those estimates. Information for interim periods may not be indicative of our operating results for the entire year.
	The disclosures included in this Quarterly Report on Form 10-Q provide an update to our 2013 Annual Report on Form 10-K.
	We evaluate events that occur after the balance sheet date, but before the financial statements are issued, for potential recognition or disclosure.  Based on the evaluation, we determined that there were no material subsequent events for recognition or disclosure other than those disclosed in this Quarterly Report.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	Accounting standard-setting organizations frequently issue new or revised accounting rules. We regularly review new pronouncements to determine their impact, if any, on our consolidated financial statements.

ACQUISITION_Tables

ACQUISITION (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Reconciliation of Fair Value of Assets Acquired and Liabilities Assumed	'
	The reconciliation of the fair value of the assets acquired and liabilities assumed related to the Onyx purchase price was as follows (in thousands):
	Purchase Price—Cash	$	38,636
	Current assets	730
	Property, plant and equipment	39,413
	Total assets acquired	40,143
	Current liabilities assumed	(1,407		)
	Other liabilities assumed	(100		)
	Net identifiable assets acquired	$	38,636
Schedule of Unaudited, Pro Forma Financial Information	'
	The following unaudited pro forma financial information for the three months ended June 30, 2013 and the six months ended June 30, 2014 and 2013 assumes that the pipeline acquisition from Onyx occurred on January 1, 2013 and includes adjustments for income from operations, including depreciation and amortization, as well as the effects of financing the acquisition (in thousands, except unit information):
		Three months ended June 30,			Six months ended June 30,
		2013			2014			2013
	Total revenue	$	155,754		$	409,303		$	301,041
	Net loss	(6,740		)	(4,357		)	(13,984		)
	Net loss attributable to common unitholders	(8,275		)	(8,463		)	(11,863		)
	Net loss per common unit—(basic and diluted)	(0.56		)	(0.43		)	(0.81		)
	Net loss attributable to subordinated unitholders	(3,556		)	(2,109		)	(7,069		)
	Net loss per subordinated unit—(basic and diluted)	(0.29		)	(0.17		)	(0.58		)

NET_LOSS_INCOME_PER_LIMITED_PA1

NET (LOSS) INCOME PER LIMITED PARTNER UNIT AND DISTRIBUTIONS (Tables)	6 Months Ended
	Jun. 30, 2014
Net loss per limited partner unit and distributions	'
Schedule of Distributions Earned and Declared	'
	The following table represents our distribution declared for the period ended June 30, 2014 and distributions paid for the prior periods (in thousands, except per unit data):
								Distributions
		Attributable to the		Per Unit				Limited Partners
	Payment Date	Quarter Ended		Distribution				Common				Subordinated				General Partner			Total
	2014
	August 14, 2014	June 30, 2014		$	0.4		(1)	$	8,593			$	4,885			$	290		$	13,768
	15-May-14	March 31, 2014		0.4				8,586				4,885				290			13,761
	2013
	February 14, 2014	December 31, 2013		0.4				8,581				4,885				289			13,755
	November 14, 2013	September 30, 2013		0.4				4,888				4,885				214			9,987
	August 14, 2013	June 30, 2013		0.4				4,890				4,886				210			9,986
	15-May-13	March 31, 2013		0.4				4,888				4,886				199			9,973
	2012
	February 14, 2013	December 31, 2012		0.24			(2)	2,931				2,931				120			5,982
	(1) The common unit distribution in the table above does not include the distribution payment to the Series A Unit holders that converted Series A Units into common units or units that vested as part of the LTIP as a result of the combination of Southcross Energy LLC and TexStar (see Note 11 and Note 14 for details).
	(2) Per unit distribution of $0.24 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the closing of our initial public offering on November 7, 2012.
Schedule of Reconciliation of Net Income loss	'
	The following is a reconciliation of the net loss attributable to our limited partners and our limited partner units and the basic and diluted earnings per unit calculations for the three and six months ended June 30, 2014 and 2013 (in thousands, except unit and per unit data):
		Three Months Ended June 30,								Six Months Ended June 30,
		2014				2013				2014				2013
	Net loss	$	(2,961	)		$	(6,192	)		$	(4,249	)		$	(12,574	)
	Series A Preferred Unit in-kind distribution and fair value adjustment (1)	(5,800		)		(5,226		)		(6,301		)		(5,226		)
	Net loss attributable to partners	$	(8,761	)		$	(11,418	)		$	(10,550	)		$	(17,800	)
	General partner's interest (2)	$	(59	)		$	(124	)		$	(84	)		$	(252	)
	Limited partners' interest (2)
	Common	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Subordinated	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	(1) The Series A Preferred Unit in-kind distribution increased the net loss attributable to partners as of June 30, 2014 in the calculation of earnings per unit (See Note 9) for the three months ended June 30, 2014. The valuation adjustment to maximum redemption value of the Series A Preferred Units as of June 30, 2014 increased the net loss available to common units in the calculation of earnings per unit (See Note 9) for the three months ended June 30, 2014 and 2013 and the six months ended June 30, 2014 and 2013.
	(2) General Partner's and Limited Partners’ interest are calculated based on the allocation of net losses for the period net of the allocation of Series A Preferred Unit in-kind distributions, Series A Preferred Unit fair value adjustments and General Partner unit in-kind distributions.
		Three Months Ended June 30,								Six Months Ended June 30,
	Common Units	2014				2013				2014				2013
	Interest in net loss	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Effect of dilutive units - numerator (1)	—				—				—				—
	Dilutive interest in net loss	$	(7,382	)		$	(7,982	)		$	(8,398	)		$	(11,108	)
	Weighted-average units - basic	21,472,420				12,222,692				19,887,523				12,218,178
	Effect of dilutive units - denominator (1)	—				—				—				—
	Weighted-average units - dilutive	21,472,420				12,222,692				19,887,523				12,218,178
	Basic and diluted net loss per common unit	$	(0.34	)		$	(0.65	)		$	(0.42	)		$	(0.91	)
		Three Months Ended June 30,								Six Months Ended June 30,
	Subordinated Units	2014				2013				2014				2013
	Interest in net loss	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	Effect of dilutive units - numerator (1)	—				—				—				—
	Dilutive interest in net loss	$	(1,320	)		$	(3,312	)		$	(2,068	)		$	(6,440	)
	Weighted-average units - basic	12,213,713				12,213,713				12,213,713				12,213,713
	Effect of dilutive units - denominator (1)	—				—				—				—
	Weighted-average units - dilutive	12,213,713				12,213,713				12,213,713				12,213,713
	Basic and diluted net loss per subordinated unit	$	(0.11	)		$	(0.27	)		$	(0.17	)		$	(0.53	)
	(1) Because we had a net loss for the three and six months ended June 30, 2014 and 2013, the effect of the dilutive units would be anti-dilutive to the per unit calculation. Therefore, the weighted average units outstanding are the same for basic and dilutive net loss per unit. The weighted average units that would be included in the computation of diluted per unit amounts in accordance with the treasury stock method were 51,334 and 21,287 unvested awards granted under our long-term incentive plan (See Note 11) and 1,832,399 and 1,816,556 Series A Preferred Units (See Note 9) for the three and six months ended June 30, 2014, respectively. The amount of unvested common units that were not included in the computation of diluted per unit amounts were 161,400 and 148,506 unvested awards granted under our long-term incentive plan and 1,398,667 and 703,197 Series A Preferred Units for the three and six months ended June 30, 2013. Diluted net income per limited partner unit reflects the potential dilution that could occur if securities or agreements to issue common units, such as awards under the long-term incentive plan, were exercised, settled or converted into common units. When it is determined that potential common units resulting from an award should be included in the diluted net income per limited partner unit calculation, the impact is reflected by applying the treasury stock method.
Series A convertible preferred units	'
Net loss per limited partner unit and distributions	'
Schedule of Distributions Earned and Declared	'
	The following table represents the paid in-kind (“PIK”) distribution earned for the period ended June 30, 2014 and the PIK distribution for the previous periods (in thousands, except per unit and in-kind distribution units):
	Payment Date	Attributable to the Quarter Ended		Per Unit Distribution					In-Kind Series A			In-Kind				In-Kind		In-Kind General Partner Distribution Value(3)
									Preferred Unit			Series A				Unit
									Distributions to Series A Preferred Holders			Preferred				Distribution
												Distributions				to General
												Value(3)				Partner
	2014
	August 14, 2014	June 30, 2014		$	0.4				32,066			$	738			654		$	15
	May 15, 2014	March 31, 2014		0.4					31,513			534				643		11
	2013
	February 14, 2014	December 31, 2013		0.4					30,971			558				632		11
	November 14, 2013	September 30, 2013		0.4					30,439			511				621		10
	August 14, 2013	June 30, 2013		0.35			(1)		22,276			512				454		10
	14-Aug-13	30-Jun-13		0.2			(2)		2,199			51				45		1
	(1) Per unit distribution of $0.35 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the issuance of 1,466,325 Series A Preferred Units and 29,925 general partner units on April 12, 2013.
	(2) Per unit distribution of $0.20 corresponds to the minimum quarterly distribution of $0.40 per unit, or $1.60 on an annualized basis, pro-rated for the portion of the quarter following the issuance of 248,675 Series A Preferred Units and 5,075 general partner units on May 15, 2013.
	(3) The fair value was calculated as required, based on the common unit price at the quarter end date for the period attributable to the distribution, multiplied by the number of units distributed.

FINANCIAL_INSTRUMENTS_Tables

FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
	Jun. 30, 2014
Derivatives	'
Schedule of the fair value of the interest rate swap liabilities	'
	The fair values of our interest rate swap liabilities were as follows (in thousands):
		Significant Other Observable Inputs (Level 2)
		Fair value measurement as of
		30-Jun-14			31-Dec-13
	Interest rate swap liabilities	$	180		$	263
Summary of amounts recognized in interest expense associated with derivatives that are not designated as hedging instruments	'
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Realized loss on interest rate derivatives	$	27		$	27		$	53		$	54
	Unrealized loss on interest rate swap derivatives	168			—			180			—
Interest rate cap contract	'
Derivatives	'
Summary of effect of cash flow hedge in statements of changes in partners' capital and members' equity and comprehensive income/(loss)	'
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Change in value recognized in other comprehensive loss - effective portion	$	—		$	40		$	(11	)	$	(30	)
	Loss reclassified from accumulated other comprehensive loss to interest expense	106			100			221			194
Commodity Swaps	'
Derivatives	'
Schedule of amounts recognized in the statement of operations	'
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Realized gain (loss) on derivatives	$	81		$	(10	)	$	(1,088	)	$	(57	)
	Unrealized loss on derivatives	(175		)	—			(131		)	—

LONGLIVED_ASSETS_Tables

LONG-LIVED ASSETS (Tables)	6 Months Ended
	Jun. 30, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of property, plant and equipment	'
	Property, plant and equipment consisted of the following (in thousands):
		Estimated	30-Jun-14			31-Dec-13
		Useful Life (yrs)
	Pipelines	30	$	383,041		$	344,721
	Gas processing, treating and other plants	15	260,289			254,133
	Compressors	7	20,459			20,030
	Rights of way and easements	15	24,998			20,729
	Furniture, fixtures and equipment	5	3,576			3,347
	Capital lease vehicles	5-Mar	1,834			1,396
	Total property, plant and equipment		694,197			644,356
	Accumulated depreciation and amortization		(97,323		)	(79,908		)
	Total		596,874			564,448
	Construction in progress		43,314			6,039
	Land and other		22,567			5,308
	Property, plant and equipment, net		$	662,755		$	575,795

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt	'
	Our outstanding debt and information related to our Credit Facility at June 30, 2014 and December 31, 2013 is as follows (in thousands):
		30-Jun-14			31-Dec-13
	Credit Facility, due November 2017	$	226,850		$	267,300
	Outstanding letters of credit	$	25,930		$	31,260
	Remaining unused borrowings	$	97,220		$	69
	Applicable margin under LIBOR borrowings	2.7		%	4.5		%

INCENTIVE_COMPENSATION_Tables

INCENTIVE COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of information regarding awards of units granted under the Incentive Plan	'
	The following table summarizes information regarding awards of units granted under the LTIP:
		Units		Weighted-average fair
				value at grant date
	Unvested - December 31, 2013	182,673		$	22.55
	Granted units	315,721		17.1
	Forfeited units	(200	)	23.01
	Units recaptured for tax withholdings	(2,108	)	19.97
	Vested units	(5,292	)	19.95
	Unvested - June 30, 2014	490,794		$	19.43
Summary of information regarding recognized compensation expense, which is included in general and administrative expense on consolidated statements of operations	'
	The following table summarizes information regarding recognized compensation expense, which is included in general and administrative expense on our consolidated statements of operations (in thousands):
		Three Months Ended June 30,					Six Months Ended June 30,
		2014			2013		2014		2013
	Unit-based compensation	$	1,082		$	685	$	1,611	$	1,093

REVENUES_Tables

REVENUES (Tables)	6 Months Ended
	Jun. 30, 2014
Revenues [Abstract]	'
Schedule of revenues by category	'
	We had revenues consisting of the following categories (in thousands):
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Sales of natural gas	$	123,401	$	106,552	$	268,759	$	204,861
	Sales of NGLs and condensate	54,282		33,792		106,155		66,212
	Transportation, gathering and processing fees	17,279		14,175		33,394		27,520
	Other	101		184		346		361
	Total revenues	$	195,063	$	154,703	$	408,654	$	298,954

CONCENTRATION_OF_CREDIT_RISK_A1

CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE (Tables)	6 Months Ended
	Jun. 30, 2014
Consolidated revenue concentration	'
Schedule of consolidated revenue attributed to Formosa and Sherwin	'
	The percentage of total consolidated revenue for each customer that exceeded 10% of total revenues for the three and six months ended June 30, 2014 and 2013 was as follows:
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Trafigura AG	13	%	(a)		12.6	%	(a)
	Sherwin Alumina Company	12.2	%	12.9	%	11	%	12.5	%
	Dow Hydrocarbons & Resources LLC	(a)		10.9	%	(a)		(a)
	Formosa Hydrocarbons Co., Inc.	(a),(b)		(a),(b)		(a),(b)		12.3	%
	(a) Information is not provided for periods for which the customer or producer was less than 10% of our consolidated revenue.
	(b) Our contract with Formosa terminated on June 1, 2013.
Top ten customers	'
Consolidated revenue concentration	'
Schedule of consolidated revenue attributed to Formosa and Sherwin	'
	Our top ten customers for the three and six months ended June 30, 2014 and 2013 represent the following percentages of consolidated revenue:
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Top ten customers	73	%	57.7	%	68.6	%	59.6	%

SUPPLEMENTAL_INFORMATION_Table

SUPPLEMENTAL INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Cash Flow Information	'
	Supplemental Cash Flow Information (in thousands)
		Six Months Ended June 30,
		2014			2013
	Supplemental Disclosures:
	Cash paid for interest, net of amounts capitalized	$	4,200		$	5,703
	Cash received for tax refunds	185			87
	Supplemental schedule of non-cash investing and financing activities:
	Accounts payable related to capital expenditures	9,656			29,288
	Change in value recognized in other comprehensive income	11			30
	Capital lease obligation	466			(1,240		)
	Accrued distribution equivalent rights (DERs) on the LTIP units	259			100
	Series A convertible preferred unit in-kind distribution and fair value adjustment	6,301			5,226
	Other	1,688			—
Capitalization of Interest Cost	'
	We incurred the following interest costs (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
	Total interest costs	$	2,225		$	3,501		$	5,297		$	6,148
	Capitalized interest included in property, plant and equipment, net	(454		)	(400		)	(553		)	(1,000		)
	Interest expense	$	1,771		$	3,101		$	4,744		$	5,148
Deferred Financing Costs	'
	Changes in deferred financing costs are as follows (in thousands):
		2014
	Deferred financing costs, January 1	$	5,237
	Capitalization of deferred financing costs (1)	166
	Less:
	Amortization of deferred financing costs	(675		)
	Deferred financing costs, June 30	$	4,728
	___________________________________________________________________________
	(1) See Note 6.
	Southcross Assets Considered Leases to Third Parties
	On March 6, 2014, we acquired natural gas pipelines and contracts related to these pipelines (See Note 2). The pipelines transport natural gas to two power plants in Nueces County, Texas under fixed-fee contracts. The contracts have a primary term through 2029 and an option to extend the agreements by an additional term of up to ten years. These contracts are considered operating leases under the applicable accounting guidance.
	Future minimum annual demand payment receipts under these agreements as of June 30, 2014, respectively, were as follows: $2.2 million in 2014 of which a portion was paid prior to our acquisition, $5.6 million in 2015, $5.6 million in 2016, $5.6 million in 2017, $2.2 million in 2018, $2.2 million in 2019 and $15.3 million thereafter. The revenue recognized for the demand payments is recognized on a straight-line basis over the term of the contract. The demand fee revenues under the contracts were $0.7 million and $0.9 million for the three and six months ended June 30, 2014 and have been included within transportation, gathering and processing fees within Note 12. The amounts do not include contingent fees based on the actual gas volumes delivered under the contracts. Contingent fees were $0.3 million and 0.4 million for the three and six months ended June 30, 2014.

ORGANIZATION_AND_DESCRIPTION_O1

ORGANIZATION AND DESCRIPTION OF BUSINESS (Details)	6 Months Ended
	Jun. 30, 2014
	segment
	plant
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Number of processing plants	3
Number of fractionation plants	2
Number of reportable segments	1

ACQUISITION_Details

ACQUISITION (Details) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Mar. 08, 2014

Mar. 06, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Mar. 06, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

plant

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Onyx Midstream LP & Onyx Pipeline Company [Member]

Pro Forma [Member]

Pro Forma [Member]

Pro Forma [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Pro Forma [Member]

Pro Forma [Member]

Pro Forma [Member]

Pro Forma [Member]

Pro Forma [Member]

Pro Forma [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of power plants

'

2

2

2

'

'

'

'

'

'

'

'

'

'

'

'

'

Contractual agreement, term

'10 years

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

'

'

'

'

$0

$0

'

'

'

'

'

'

'

'

'

'

'

Fair Value of Assets Acquired and Liabilities Assumed, Net [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current assets

'

'

'

'

'

'

'

730,000

'

'

'

'

'

'

'

'

'

Property, plant, and equipment

'

'

'

'

'

'

'

39,413,000

'

'

'

'

'

'

'

'

'

Total assets acquired

'

'

'

'

'

'

'

40,143,000

'

'

'

'

'

'

'

'

'

Current liabilities assumed

'

'

'

'

'

'

'

-1,407,000

'

'

'

'

'

'

'

'

'

Other liabilities assumed

'

'

'

'

'

'

'

-100,000

'

'

'

'

'

'

'

'

'

Net identifiable assets acquired

'

'

'

'

'

'

'

38,636,000

'

'

'

'

'

'

'

'

'

Acquisition related costs

'

'

'

'

'

300,000

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total revenue

'

'

'

'

'

'

'

'

155,754,000

409,303,000

301,041,000

'

'

'

'

'

'

Net loss

'

'

'

'

'

'

'

'

-6,740,000

-4,357,000

-13,984,000

-8,275,000

-8,463,000

-11,863,000

-3,556,000

-2,109,000

-7,069,000

Net loss per common unitb(basic and diluted) (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

($0.56)

($0.43)

($0.81)

($0.29)

($0.17)

($0.58)

Revenue recognized since acquisition date

'

'

300,000

400,000

1,300,000

1,600,000

'

'

'

'

'

'

'

'

'

'

'

Net loss recognized since acquisition date

'

'

'

'

$400,000

'

$300,000

'

'

'

'

'

'

'

'

'

'

NET_LOSS_INCOME_PER_LIMITED_PA2

NET (LOSS) INCOME PER LIMITED PARTNER UNIT AND DISTRIBUTIONS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Limited Partner Unit	'	'	'	'
Net loss	($2,961,000)	($6,192,000)	($4,249,000)	($12,574,000)
Series A Preferred Unit in-kind distribution and fair value adjustment	6,301,000	560,000	'	560,000
Net loss attributable to partners	-8,761,000	-11,418,000	-10,550,448	-17,800,000
General partner's interest	-2,961,000	-6,192,000	-4,249,000	-12,574,000
General Partner [Member]	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Net Income (Loss) Allocated to General Partners	'	'	-85,000	-252,000
Net loss	-59,000	-124,000	-84,000	'
General partner's interest	-59,000	-124,000	-84,000	'
Limited Partner, units authorized	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Net loss	'	-6,168,000	'	'
General partner's interest	'	-6,168,000	'	'
Limited partners' interest	-7,382,000	-7,982,000	-8,398,000	-11,108,000
Interest in net loss	-7,382,000	-7,982,000	-8,398,000	-11,108,000
Dilutive interest in net loss	-7,382,000	-7,982,000	-8,398,000	-11,108,000
Weighted-average units - basic	21,472,420	12,222,692	19,887,523	12,218,178
Weighted-average units - dilutive	21,472,420	12,222,692	19,887,523	12,218,178
Basic and diluted net loss per common unit	($0.34)	($0.65)	($0.42)	($0.91)
Subordinated Units [Member]	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Limited partners' interest	-1,320,000	-3,312,000	-2,068,000	-6,439,571
Interest in net loss	-1,320,000	-3,312,000	-2,068,000	-6,440,000
Dilutive interest in net loss	-1,320,000	-3,312,000	-2,068,000	-6,440,000
Weighted-average units - basic	12,213,713	12,213,713	12,213,713	12,213,713
Weighted-average units - dilutive	12,213,713	12,213,713	12,213,713	12,213,713
Basic and diluted net loss per common unit	($0.11)	($0.27)	($0.17)	($0.53)
Series A convertible preferred units	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Weighted average units not included in the computation of diluted per unit (in shares)	1,832,399	'	1,816,556	'
Phantom Share Units (PSUs)	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Weighted average units not included in the computation of diluted per unit (in shares)	51,334	161,400	21,287	148,506
Common Units [Member] | Limited Partner, units authorized	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Limited partners' interest	'	-7,982,000	'	'
Series A convertible preferred units	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Series A Preferred Unit in-kind distribution and fair value adjustment	5,800,000	5,226,000	-6,301,000	-5,226,000
Series A convertible preferred units	'	'	'	'
Earnings Per Limited Partner Unit	'	'	'	'
Preferred unit Conversion Common Units Exchange Ratio on Satisfaction of Specified Condition	110.00%	'	'	'
Number of Common Units to be Issued on Conversion of One Preferred Unit	2,015,638	'	'	'
Series A Preferred Unit in-kind distribution and fair value adjustment	$738,000	'	$1,272,000	'

NET_LOSS_INCOME_PER_LIMITED_PA3

NET (LOSS) INCOME PER LIMITED PARTNER UNIT AND DISTRIBUTIONS (Distributions) (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

15-May-13

Apr. 12, 2013

15-May-13

Apr. 12, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Mar. 13, 2014

Jun. 30, 2013

Mar. 27, 2013

Nov. 07, 2012

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

PIK distribution

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

In Kind Distribution [Member]

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Cash

Maximum [Member]

QTD

YTD

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

item

General Partner [Member]

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Preferred units issued

Cash

In Kind Distribution [Member]

In Kind Distribution [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Limited Partners

Distributions made to Limited Partner [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'45 days

'

'

'

'

'

'

Amount raised through issuance of units

'

'

'

'

'

'

'

'

'

$40,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Units, Issued

'

'

'

'

'

'

'

1,715,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred units issued

'

'

'

'

'

'

248,675

1,466,325

'

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

unused borrowings

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-350,000,000

-350,000,000

-250,000,000

-350,000,000

Number of quarters for quarterly distributions in-kind required to be paid

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution percentage

'

'

'

'

'

'

'

'

'

'

'

'

7.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest held by general partners (as a percent)

'

2.00%

'

2.00%

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum quarterly distribution (in dollars per unit)

$0.40

$0.40

'

'

'

'

'

'

'

'

$0.40

'

'

$0.40

'

'

'

'

'

'

'

'

'

'

$0.40

$0.40

$0.40

'

$0.40

$0.40

$0.40

'

'

'

'

'

'

'

$0.40

'

'

'

$0.40

'

'

$0.80

$0.80

$0.40

'

'

'

$0.40

'

'

'

'

'

'

'

'

'

'

'

'

Minimum annual distribution (in dollars per unit)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.60

'

'

$1.60

'

'

'

'

Series A preferred units , PIK distribution earned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner Unit Distributions Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.20

'

$0.40

$0.40

$0.35

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

In-Kind Unit Distribution (in dollars)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,199,000

31,513,000

30,971,000

30,439,000

22,276,000

45,000

643,000

632,000

621,000

454,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

In-Kind Distributions (in dollars per unit)

0

'

-26,000

'

'

'

'

'

'

'

'

'

'

'

51,000

534,000

558,000

511,000

512,000

1,000

11,000

11,000

10,437

10,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common units, distribution declared and paid

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner, Distribution Paid in Cash

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$13,768,000

$13,761,000

$13,755,000

$9,987,000

$9,986,000

$9,973,000

$5,982,000

$290,000

$290,000

$289,000

$214,000

$210,000

$199,000

$120,000

$8,593,000

$8,586,000

$8,581,000

$4,888,000

$4,890,000

$4,888,000

$2,931,000

'

'

$4,885,485

$4,885,000

$4,885,000

$4,885,000

$4,886,000

$4,886,000

$2,931,000

$0

$0

'

'

'

'

'

'

'

'

General partner units issued (in shares)

'

'

'

'

5,075

29,925

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Limited Partner, Distributions Paid, Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.20

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.40

$1.60

'

'

'

'

FINANCIAL_INSTRUMENTS_Details

FINANCIAL INSTRUMENTS (Details) (USD $)

1 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Feb. 28, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jul. 01, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Commodity Swaps [Member]

Commodity Swaps [Member]

Commodity Swaps [Member]

Commodity Swaps [Member]

Commodity Swaps [Member]

Interest rate swap liabilities

Interest rate swap liabilities

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Recurring basis

Recurring basis

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

MMBTU

MMBTU

Significant Other Observable Inputs (Level 2)

Significant Other Observable Inputs (Level 2)

Interest rate swap liabilities

Interest rate swap liabilities

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest Rate Cap [Member]

Interest rate swap liabilities

Interest rate swap liabilities

Fair value of financial instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Sale of Derivatives

'

'

'

$81,000

($10,000)

($1,088,000)

($57,000)

'

'

'

$27,000

$27,000

$53,000

$54,000

'

'

'

'

'

'

'

'

Derivative, Nonmonetary Notional Amount, Energy Measure

'

'

'

'

'

37,320

'

33,722

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-11,000

'

0

40,000

'

-30,000

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

106,000

100,000

221,000

194,000

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

150,000,000

140,000,000

'

'

'

'

Unrealized Gain (Loss) on Derivatives

'

-312,000

0

-175,000

0

-131,000

'

'

'

'

168,000

0

180,000

0

'

'

'

'

'

'

'

'

Repayments of Lines of Credit

148,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-100,000

'

'

'

'

'

Derivative liability, current

'

'

'

'

'

'

'

'

200,000

300,000

'

'

'

'

'

'

'

'

'

'

'

'

Derivative liability, non-current

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value measurement

'

'

'

'

'

'

'

'

'

'

'

'

'

'

180,000

263,000

'

'

'

'

'

'

Derivative, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'one-month LIBOR

'

'

'

'

'

Derivative, Fixed Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.54%

0.33%

'

'

'

'

Derivative, Fair Value, Net

'

'

'

$0

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

FINANCIAL_INSTRUMENTS_Details_

FINANCIAL INSTRUMENTS (Details 2) (USD $)

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jul. 01, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate cap contract

Interest rate swap contract

Interest rate swap contract

Commodity Swaps

Commodity Swaps

Commodity Swaps

Commodity Swaps

Commodity Swaps

Other Current Assets

Other Current Assets

Other Current Liabilities

Other Current Liabilities

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

MMBTU

MMBTU

Commodity Swaps

Commodity Swaps

Commodity Swaps

Commodity Swaps

Derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset, Fair Value, Gross Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$140,000

'

'

Derivative Liability, Fair Value, Gross Liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-20,000

-12,000

-20,000

Derivative Liability, Amount Offset Against Derivative Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

20,000

Notional amount

'

'

'

'

'

'

'

'

'

'

150,000,000

140,000,000

'

'

'

'

'

'

'

'

'

Description of variable rate

'

'

'

'

'

'

'

'

'

'

'one-month LIBOR

'

'

'

'

'

'

'

'

'

'

LIBOR based fixed rate paid (as a percent)

'

'

'

'

'

'

'

'

'

'

0.54%

0.33%

'

'

'

'

'

'

'

'

'

Change in value recognized in other comprehensive income/(loss) (effective portion)

'

'

'

'

'

'

0

40,000

'

-30,000

-11,000

'

'

'

'

'

'

'

'

'

'

Loss reclassified from accumulated other comprehensive loss to income/loss

'

'

'

'

'

'

106,000

100,000

221,000

194,000

'

'

'

'

'

'

'

'

'

'

'

Estimated amount of hedging losses to be reclassified from accumulated other comprehensive income into income/(loss)

'

'

'

'

'

'

'

'

'

'

100,000

'

'

'

'

'

'

'

'

'

'

Unrealized loss

-312,000

0

168,000

0

180,000

0

'

'

'

'

'

'

-175,000

0

-131,000

'

'

'

'

'

'

Realized (loss) on derivatives

'

'

27,000

27,000

53,000

54,000

'

'

'

'

'

'

81,000

-10,000

-1,088,000

-57,000

'

'

'

'

'

Volume of month-ahead swap contracts (in MMBtu)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

37,320

'

33,722

'

'

'

'

Derivative, Fair Value, Net

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

$0

'

'

$0

$120,000

($12,000)

$0

LONGLIVED_ASSETS_Details

LONG-LIVED ASSETS (Details) (USD $)

1 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

Jan. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Mar. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Property, plant and equipment excluding construction in progress and land and other

Property, plant and equipment excluding construction in progress and land and other

Pipelines

Pipelines

Pipelines

Gas processing, treating and other plants

Gas processing, treating and other plants

Gas processing, treating and other plants

Compressors

Compressors

Compressors

Rights of way and easements

Rights of way and easements

Rights of way and easements

Furniture, fixtures and equipment

Furniture, fixtures and equipment

Furniture, fixtures and equipment

Capital lease vehicles

Capital lease vehicles

Capital lease vehicles

Capital lease vehicles

Construction in progress

Construction in progress

Land and other

Land and other

Maximum [Member]

Minimum [Member]

Property, plant and equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated useful life

'

'

'

'

'

'

'

'

'

'30 years

'30 years

'

'15 years

'15 years

'

'7 years

'7 years

'

'15 years

'15 years

'

'5 years

'5 years

'

'

'

'5 years

'3 years

'

'

'

'

Total property, plant and equipment

'

$694,197,000

'

$694,197,000

'

$644,356,000

'

'

'

$383,041,000

'

$344,721,000

$260,289,000

'

$254,133,000

$20,459,000

'

$20,030,000

$24,998,000

'

$20,729,000

$3,576,000

'

$3,347,000

$1,834,000

$1,396,000

'

'

'

'

'

'

Accumulated depreciation and amortization

'

-97,323,000

'

-97,323,000

'

-79,908,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

'

662,755,000

'

662,755,000

'

575,795,000

'

596,874,000

564,448,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

43,314,000

6,039,000

22,567,000

5,308,000

Depreciation expense

'

8,978,000

8,261,000

17,506,000

15,510,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Service charges

6,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount recovered from insurance

'

'

'

600,000

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deductible amount

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intangible assets, net

'

$1,539,000

'

$1,539,000

'

$1,568,000

$1,554,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Asset, Useful Life

'

'

'

'30 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LONGTERM_DEBT_Details

LONG-TERM DEBT (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

0 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2014

Apr. 12, 2013

Jun. 30, 2014

Dec. 31, 2013

Mar. 13, 2014

Jan. 29, 2014

Jun. 30, 2013

Mar. 27, 2013

Nov. 07, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Apr. 12, 2013

Nov. 07, 2012

Jun. 30, 2012

Jan. 29, 2014

Oct. 02, 2014

Jun. 30, 2014

Jun. 30, 2014

General Partner [Member]

General Partner [Member]

Series A convertible preferred units

Prior to Covenant Election [Member]

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Letters of credit

Letters of credit

Credit Agreement, due June 2014

Revolving Credit Facility [Member]

Scenario, Forecast [Member]

Scenario, Actual [Member]

Scenario, Actual [Member]

30-Sep-13

30-Sep-13

30-Sep-13

30-Sep-13

After Covenant Election [Member]

Credit Facility, due November 2017

Credit Facility, due November 2017

Credit Facility, due November 2017

Prior to Covenant Election [Member]

Prior to Covenant Election [Member]

After Covenant Election [Member]

LONG TERM DEBT

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

$226,850,000

'

$226,850,000

'

$267,300,000

'

'

'

'

'

$226,850,000

$267,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

unused borrowings

'

'

'

'

'

'

'

'

'

'

'

'

350,000,000

'

350,000,000

250,000,000

350,000,000

'

'

'

'

'

50,000,000

75,000,000

'

'

'

'

'

Fees incurred in connection with the amendment to credit facility

'

'

'

'

'

'

'

'

'

1,500,000

'

'

'

100,000

'

600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio for one quarter

'

'

'

'

'

'

'

'

'

4.25

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio for two consecutive quarters

'

'

'

'

'

'

'

'

'

4.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Amount Outstanding

'

'

'

'

'

25,900,000

31,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Remaining Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

97,220,000

69,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average outstanding borrowings

190,000,000

235,200,000

191,600,000

231,184,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Description of variable rate basis

'

'

'

'

'

'

'

'

'

'LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Applicable margin under LIBOR borrowings

'

'

'

'

'

'

'

'

'

4.50%

2.65%

4.50%

'

'

'

'

'

'

'

'

'

'

'

'

3.25%

'

'

'

'

Weighted average interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.70%

4.60%

3.60%

4.10%

'

'

'

'

'

'

'

'

Maximum growth capital expenditures for the remainder of 2013

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum additional growth capital expenditures for the subsequent 18 months ended June 30, 2015

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in amount deposited by general partner into the Collateral Account

'

'

'

'

'

'

'

'

'

28,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum quarterly distributions until the target leverage ratio is achieved (in dollars per share)

'

'

$0.40

'

'

'

'

'

'

$0.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total capital infusion

'

'

'

'

'

'

'

40,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument Covenant Consolidated Senior Secured Leverage Ratio Required to be Maintained upon Exercising One Time Covenant Election

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.5

Minimum consolidated interest coverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.5

'

'

'

'

2.5

'

'

Debt Instrument Leverage Ratio

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowings

226,900,000

257,000,000

267,300,000

257,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Covenant, Limitation on Acquisition Price, Business Combination

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$40,000,000

'

'

'

Maximum adjusted consolidated total leverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.75

'

4.5

5.25

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	item		item
Legal Matters	'	'	'	'
Number of pending proceedings	0	'	0	'
Capital leases	'	'	'	'
Amortization expense related to the capital leases	$100,000	$100,000	$300,000	$200,000
Capital Lease Obligations Incurred	132,000	100,000	466,000	1,240,000
Operating Leases	'	'	'	'
Expenses associated with operating leases	400,000	300,000	700,000	800,000
Equipment related to capital projects	'	'	'	'
Purchase commitments	'	'	'	'
Commitments	'	'	19,400,000	'
Other Capital Projects [Member]	'	'	'	'
Purchase commitments	'	'	'	'
Commitments	'	'	$0	'

TRANSACTIONS_WITH_RELATED_PART1

TRANSACTIONS WITH RELATED PARTIES (Details) (USD $)

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

15-May-13

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

officer

Preferred units issued

Preferred units issued

Management fees incurred

Management fees incurred

Management fees incurred

Management fees incurred

Management fees incurred

General Partner interest [Member]

General Partner interest [Member]

General Partner interest [Member]

General Partner interest [Member]

Affiliates of Wells Fargo Bank NA [Member]

Affiliates of Wells Fargo Bank NA [Member]

Affiliates of Wells Fargo Bank NA [Member]

director

Vested units

Vested units

Vested units

Vested units

Related Party Transactions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Management fees incurred

'

'

'

'

$0

$6,200,000

$0

$12,100,000

$100,000

$100,000

$200,000

$300,000

'

'

'

Number of officers

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of directors

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reimbursements expenses incurred

'

'

'

7,700,000

'

'

'

'

'

'

'

15,100,000

'

'

'

Purchase price of units (in dollars per share)

'

$22.86

$22.86

'

'

'

'

'

'

'

'

'

'

'

'

Payments for Fees

'

'

'

'

'

'

'

'

'

'

'

'

$1,400,000

$200,000

$2,000,000

SERIES_A_PREFERRED_UNITS_Detai

SERIES A PREFERRED UNITS (Details) (USD $)

3 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

15-May-13

Apr. 12, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

General Partner [Member]

General Partner [Member]

General Partner [Member]

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Preferred units issued

Series A convertible preferred units

Series A convertible preferred units

Series A convertible preferred units

Series A convertible preferred units

item

General Partner [Member]

General Partner [Member]

Vested units

Conversion of Stock, Shares Converted

'

'

'

'

'

'

'

'

'

'

2,015,638

'

'

'

'

'

'

'

'

'

Preferred units issued

'

'

'

'

'

'

'

'

248,675

1,466,325

'

1,500,000

'

'

'

1,715,000

'

'

'

'

Purchase price of units (in dollars per share)

'

'

'

'

'

'

'

'

$22.86

'

'

$22.86

'

'

'

'

'

'

'

'

Total capital infusion

'

'

'

'

'

'

'

'

'

'

'

$40,000,000

'

'

'

'

'

'

'

'

Proceeds from issuance of units

'

'

'

'

'

'

'

'

'

'

'

'

'

39,200,000

'

'

'

'

'

'

Capital contribution

'

'

'

'

3,115,000

3,115,000

800,000

'

'

'

'

'

'

'

800,000

'

'

'

'

'

Ownership interest held by general partners (as a percent)

'

'

2.00%

'

'

'

'

2.00%

'

'

'

'

'

'

2.00%

'

'

'

'

'

Valuation adjustment to maximum redemption value

-5,062,000

-4,666,000

-5,029,000

-4,666,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred unit in-kind distribution and fair value adjustment

($6,301,000)

($560,000)

'

($560,000)

'

'

'

'

'

'

($738,000)

'

($1,272,000)

'

'

'

($5,800,000)

($5,226,000)

$6,301,000

$5,226,000

Voting rights per preferred unit

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

Number of first full quarters for entitlement to distribution in-kind for preferred unit holders

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

Rate per outstanding unit per quarter for preferred units to be distributed as in-kind distributions (in dollars per unit)

'

'

'

'

'

'

'

'

'

'

0.4

'

'

'

'

'

'

'

'

'

Rate per year of the per unit purchase price for preferred units to be distributed as in-kind distributions (as a percent)

'

'

'

'

'

'

'

'

'

'

7.00%

'

'

'

'

'

'

'

'

'

Rate per unit per quarter used for determination of cash distributions (in dollars per unit)

'

'

'

'

'

'

'

'

'

'

0.4

'

'

'

'

'

'

'

'

'

Exchange ratio of conversion of preferred units into common units on satisfaction of specified condition

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

PARTNERS_CAPITAL_Details

PARTNERS' CAPITAL (Details) (USD $)

6 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

In Thousands, except Share data, unless otherwise specified

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Aug. 06, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Feb. 28, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

15-May-13

Apr. 12, 2013

Feb. 28, 2014

Limited Partner, units authorized

Limited Partner, units authorized

Limited Partner, units authorized

Subordinated Units [Member]

Subordinated Units [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Common Stock [Member]

Partners' Capital Account, Units, Authorized for Public Offering

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,200,000

Entity Common Stock, Shares Outstanding

'

'

'

23,497,782

'

'

'

'

'

'

'

'

'

'

'

Limited Partner, units issued

'

'

21,465,046

'

12,253,985

12,213,713

12,213,713

'

'

'

'

'

'

'

'

Limited Partner, units authorized

'

'

23,163,713

'

13,963,713

12,213,713

'

'

'

'

'

'

'

'

'

General Partner, units outstanding

'

'

'

'

'

'

'

'

724,495

'

724,495

534,638

'

'

'

Capital contribution

'

$3,115

$0

'

'

$0

'

'

$3,115

$800

'

'

'

'

'

Issue of additional general partner unit

'

'

'

'

'

'

'

'

'

'

'

'

5,075

29,925

'

Ownership interest held by general partners (as a percent)

2.00%

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

Limited Partner, units outstanding

'

'

21,454,119

'

12,253,985

12,213,713

12,213,713

'

'

'

'

'

'

'

'

INCENTIVE_COMPENSATION_Details

INCENTIVE COMPENSATION (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Mar. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Vested units

Incentive Plan

Incentive Plan

Incentive Plan

Incentive Plan

Matching contributions expensed for employee savings plan

Matching contributions expensed for employee savings plan

Matching contributions expensed for employee savings plan

Matching contributions expensed for employee savings plan

Vested units

Unit based compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

Matching contributions expensed for employee savings plan

'

'

'

'

'

'

'

'

'

$234,000

$161,000

$590,000

$310,000

Employer matching contribution, percent of employee's contribution

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

Vesting period

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

Units

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested - December 31, 2013

'

'

'

'

'

'

'

'

182,673

'

'

'

'

Granted units

'

'

'

'

'

'

315,721

'

'

'

'

'

'

Units recaptured for tax withholdings

'

'

'

'

-5,292

'

'

'

'

'

'

'

'

Unvested at the end of the period (in shares)

'

'

'

'

'

'

490,794

'

182,673

'

'

'

'

Weighted-average grant date fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested - December 31, 2013

'

'

'

'

'

'

'

'

$22.55

'

'

'

'

Granted units

'

'

'

'

'

'

$17.10

'

'

'

'

'

'

Vested units

'

'

'

'

$19.95

'

'

'

'

'

'

'

'

Unvested - June 30, 2014

'

'

'

'

'

'

$19.43

'

$22.55

'

'

'

'

Fair value

'

'

'

'

'

740,000

5,398,000

'

'

'

'

'

'

Share-based compensation cost not yet recognized

'

'

'

'

'

'

7,500,000

3,000,000

'

'

'

'

'

Period of amortization of compensation expense

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

Units available for issuance (in shares)

'

'

'

'

'

1,579,621

1,213,642

'

'

'

'

'

'

Unit-based compensation

1,082,000

685,000

1,611,000

1,093,000

'

'

'

'

'

'

'

'

'

Units recaptured for tax withholdings

'

'

'

'

'

'

-2,108

'

'

'

'

'

'

Units recaptured for tax withholdings

'

'

'

'

'

'

$19.97

'

'

'

'

'

'

Employer matching contribution, percent of employees' gross pay

'

'

'

'

'

'

'

'

'

'

'

6.00%

'

Maximum annual contributions by employer, amount (per employee)

'

'

'

'

'

'

'

'

'

'

'

$17,500

'

REVENUES_Details

REVENUES (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues [Abstract]	'	'	'	'
Sales of natural gas	$123,401	$106,552	$268,759	$204,861
Sales of NGLs and condensate	54,282	33,792	106,155	66,212
Transportation, gathering and processing fees	17,279	14,175	33,394	27,520
Other	101	184	346	361
Total revenues	$195,063	$154,703	$408,654	$298,954

CONCENTRATION_OF_CREDIT_RISK_A2

CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE (Details) (Customer concentration, Consolidated revenue)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
			customer	customer
Trafigura AG	'	'	'	'
Consolidated revenue concentration	'	'	'	'
Concentration risk percentage	13.00%	'	12.60%	'
Formosa Hydrocarbons Co., Inc.	'	'	'	'
Consolidated revenue concentration	'	'	'	'
Concentration risk percentage	'	'	'	12.30%
Top ten customers	'	'	'	'
Consolidated revenue concentration	'	'	'	'
Number of top customers	'	'	10	10
Concentration risk percentage	73.00%	57.70%	68.60%	59.60%
Sherwin Alumina Company	'	'	'	'
Consolidated revenue concentration	'	'	'	'
Concentration risk percentage	12.20%	12.90%	11.00%	12.50%

SUBSEQUENT_EVENTS_Details

SUBSEQUENT EVENTS (Details) (USD $)

6 Months Ended

1 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

Jun. 30, 2014

Feb. 28, 2014

Jun. 30, 2014

Dec. 31, 2013

Aug. 04, 2014

Aug. 05, 2014

Aug. 04, 2014

Aug. 04, 2014

Aug. 04, 2014

Jul. 25, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 04, 2014

Jun. 30, 2014

Aug. 04, 2014

Aug. 04, 2014

Jul. 25, 2014

Jan. 29, 2014

Aug. 04, 2014

Mar. 13, 2014

Jun. 30, 2013

Mar. 27, 2013

Nov. 07, 2012

Aug. 04, 2014

Aug. 04, 2014

Aug. 04, 2014

Apr. 12, 2013

Nov. 07, 2012

Aug. 04, 2014

Aug. 04, 2014

Aug. 04, 2014

Aug. 04, 2014

director

General Partner interest [Member]

General Partner interest [Member]

General Partner interest [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Series A convertible preferred units

Series A convertible preferred units

Series B Redeemable Preferred Units [Member]

Maximum [Member]

Subordinated Limited Partners [Member]

Common Class B [Member]

Common Class B [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Senior Secured Credit Facility [Member]

Secured Debt [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Pipelines [Member]

General Partner interest [Member]

General Partner interest [Member]

Limited Partner [Member]

Cash

General Partner interest [Member]

Subsequent Event [Member]

Cash

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Maximum [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Revolving Credit Facility [Member]

Secured Debt [Member]

Subsequent Event [Member]

Cash

Cash

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent events

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner Unit Distributions Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

$0.33

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner Distribution Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'45 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution per common and subordinated unit (in dollars per unit)

'

'

'

'

'

'

'

'

'

$0.40

'

'

'

'

'

'

$0.44

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Transaction Costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$80,000,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000,000

General Partners' Capital Account, Units Outstanding

'

'

724,495

534,638

'

'

'

2,116,400

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Entity Common Stock, Shares Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,213,713

14,633,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest held by general partners (as a percent)

2.00%

'

2.00%

'

'

'

2.00%

'

39.80%

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of directors

3

'

'

'

'

7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred unit Conversion Common Units Exchange Ratio on Satisfaction of Specified Condition

'

'

'

'

'

'

'

'

'

'

110.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

350,000,000

350,000,000

250,000,000

350,000,000

'

'

'

50,000,000

75,000,000

75,000,000

'

'

'

Debt Instrument Leverage Ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.5

5.75

'

'

'

'

'

'

'

Debt Instrument, Covenant Maximum Adjusted Consolidated Total Leverage Ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.75

'

'

'

'

'

5.5

'

5.25

'

'

'

'

5

'

Debt Instrument, Covenant, Limitation on Acquisition Price, Business Combination

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

200,000,000

'

'

'

'

'

'

'

'

'

'

450,000,000

'

'

Amortization of Debt Discount (Premium)

'

'

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

SUPPLEMENTAL_INFORMATION_Detai

SUPPLEMENTAL INFORMATION (Details) (USD $)	0 Months Ended		3 Months Ended		6 Months Ended
	Mar. 08, 2014	Mar. 06, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
		plant
Operating Leased Assets [Line Items]	'	'	'	'	'	'	'
Cash paid for interest, net of amounts capitalized	'	'	'	'	$4,200,000	$5,703,000	'
Cash received for tax refunds	'	'	'	'	185,000	87,000	'
Accounts payable related to capital expenditures	'	'	'	'	9,656,000	29,288,000	'
Change in value recognized in other comprehensive income	'	'	'	'	11,000	30,000	'
Capital lease obligation	'	'	-132,000	-100,000	-466,000	-1,240,000	'
Accrued distribution equivalent rights (DERs) on the LTIP units	'	'	'	'	259,000	100,000	'
Series A convertible preferred unit in-kind distribution and fair value adjustment	'	'	-6,301,000	-560,000	'	-560,000	'
Other	'	'	'	'	1,688,000	0	'
Interest Costs Incurred [Abstract]	'	'	'	'	'	'	'
Total interest costs	'	'	2,225,000	3,501,000	'	'	'
Capitalized interest included in property, plant and equipment, net	'	'	-454,000	-400,000	'	'	'
Interest expense	'	'	1,771,000	3,101,000	'	'	'
Deferred Financing Costs [Roll Forward]	'	'	'	'	'	'	'
Deferred financing costs, January 1	'	'	4,728,000	'	4,728,000	'	5,237,000
Capitalization of deferred financing costs	'	'	'	'	166,000	'	'
Amortization of deferred financing costs	'	'	'	'	-675,000	-602,000	'
Deferred financing costs, June 30	'	'	4,728,000	'	4,728,000	'	5,237,000
Number of power plants	'	2	2	'	2	'	'
Contractual agreement, term	'10 years	'10 years	'	'	'	'	'
Contingent fees	'	'	700,000	'	900,000	'	'
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	'	'	300,000	'	400,000	'	'
Natural Gas Pipeline Contracts [Member]	'	'	'	'	'	'	'
Deferred Financing Costs [Roll Forward]	'	'	'	'	'	'	'
Operating leases, future minimum payments due, remainder of current year	'	'	2,200,000	'	2,200,000	'	'
Operating leases, future minimum payments due in second year	'	'	5,600,000	'	5,600,000	'	'
Operating leases, future minimum payments due in third year	'	'	5,600,000	'	5,600,000	'	'
Operating leases, future minimum payments due in fourth year	'	'	5,600,000	'	5,600,000	'	'
Operating leases, future minimum payments due in fifth year	'	'	2,200,000	'	2,200,000	'	'
Operating leases, future minimum payments due in sixth year	'	'	2,200,000	'	2,200,000	'	'
Operating leases, future minimum payments due after sixth year	'	'	15,300,000	'	15,300,000	'	'
Series A convertible preferred units	'	'	'	'	'	'	'
Operating Leased Assets [Line Items]	'	'	'	'	'	'	'
Series A convertible preferred unit in-kind distribution and fair value adjustment	'	'	($5,800,000)	($5,226,000)	$6,301,000	$5,226,000	'