PROPERTY, PLANT, AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
PROPERTY, PLANT, AND EQUIPMENT, NET
Gross	$ 1,291,694		$ 1,291,694		$ 1,229,428
Less accumulated depreciation	92,967		92,967		71,347
Property, plant, and equipment, net	1,198,727		1,198,727		1,158,081
Depreciation expense	11,104	8,508	21,625	16,325
Capitalized interest	2,329	1,066	3,688	1,559
Gas gathering system
PROPERTY, PLANT, AND EQUIPMENT, NET
Useful lives			30 years
Gross	810,617		810,617		744,359
Compressor stations and compression equipment
PROPERTY, PLANT, AND EQUIPMENT, NET
Useful lives			30 years
Gross	393,483		393,483		380,000
Construction in progress
PROPERTY, PLANT, AND EQUIPMENT, NET
Gross	63,419		63,419		83,765
Other
PROPERTY, PLANT, AND EQUIPMENT, NET
Gross	$ 24,175		$ 24,175		$ 21,304
Other | Minimum
PROPERTY, PLANT, AND EQUIPMENT, NET
Useful lives			4 years
Other | Maximum
PROPERTY, PLANT, AND EQUIPMENT, NET
Useful lives			15 years