LONG-TERM DEBT (Details)		3 Months Ended			6 Months Ended
LONG-TERM DEBT (Details)	Aug. 04, 2014 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
LONG TERM DEBT
DIP credit facility					$ 126,562,000	$ 0
Rolled-Up Loans					127,500,000	0
Other lease right-of-use assets					$ 5,868,000,000
Consolidated Total Leverage Ratio					5.00
Amortization of deferred financing costs and PIK interest						(1,777,000)
Write-off of Deferred Financing Costs		$ 4,400,000			$ (4,401,000)	0
Long-term Debt		662,156,000			662,156,000				$ 526,318,000
Total debt, subject to compromise					(407,925,000)	0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		0			0				(814,000)
Long-term Debt, Current Maturities		254,231,000			254,231,000				521,123,000
Debt Issuance Costs, Net		0	$ (6,774,000)		0	(6,774,000)			(5,195,000)	$ (8,295,000)
Deferred Financing Costs, Capitalized During Period					0	256,000
Amortization of Debt Issuance Costs and Discounts					(794,000)
Long-term Debt, Excluding Current Maturities		0			0				0
Average outstanding borrowings		$ 643,239,000	$ 585,515,000		$ 530,793,000	$ 530,793,000
Line of Credit Facility, Interest Rate Description	0.01
Weighted average interest rate		11.89%	10.03%		7.27%	6.94%
Maximum quarterly distributions until the target leverage ratio is achieved (in dollars per share) \| $ / shares							$ 0.40
Maximum borrowings		$ 662,367,000	$ 662,367,000		$ 530,806,000	$ 532,952,000
Proceeds from Issuance of Other Long-term Debt	$ 450,000,000
Amortization of Debt Discount (Premium)	0.01
Debt Instrument, Periodic Payment	$ 1,064,000
Paid-in-Kind Interest, Term Loan					7,800,000
Debt Instrument, Unamortized Discount							$ (1,600,000)				$ (1,800,000)
Proceeds from issuance of Senior Unsecured Note				$ 15,000,000
Paid-in-Kind Interest		500,000			2,400,000
Other current operating lease liabilities					1,522,000,000
Other long-term operating lease liabilities					5,481,000,000
Total operating lease liabilities					$ 7,003,000,000
Discount rate, operating leases					10.00%
weighted average lease term					$ 6,000
Paid-in-Kind Interest, Revolving Credit Facility		200,000
General Partner [Member]
LONG TERM DEBT
Line of Credit Facility, Amount Outstanding		21,663,000			21,663,000				27,738,000
Unsecured Debt [Member]
LONG TERM DEBT
Long-term Debt		17,383,000			17,383,000			$ 17,400,000	16,867,000
Credit Facility, due November 2017
LONG TERM DEBT
Long-term Debt		81,293,000			81,293,000			81,100,000	81,124,000
Line of Credit Facility, Remaining Borrowing Capacity		33,337,000			33,337,000				6,138,000
Applicable margin under LIBOR borrowings	4.25%
Term Loan [Member]
LONG TERM DEBT
Long-term Debt		$ 309,418,000			$ 309,418,000			$ 429,100,000	$ 429,141,000
Credit Agreement, due June 2014
LONG TERM DEBT
Applicable margin under LIBOR borrowings							3.25%

Southcross Energy Partners, L.P. 10-Q