STATEMENTS OF INCOME (Predecessor [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Predecessor [Member]
Gross Margin
Revenues	$ 1,689,952	$ 1,376,649	$ 1,621,334
Cost of natural gas, including affiliate	876,944	620,260	869,499
Net margin	813,008	756,389	751,835
Operating expenses
Operations and maintenance, including affiliate	393,072	363,120	373,511
Depreciation and amortization, including affiliate	144,758	130,150	132,212
General taxes	54,830	47,405	46,452
Total operating expenses	592,660	540,675	552,175
Operating income	220,348	215,714	199,660
Other income, including affiliate	6,165	3,664	140
Other expense, including affiliate	(3,680)	(2,225)	(2,919)
Interest expense, including affiliate	(61,366)	(60,793)	(54,119)
Income before income taxes	161,467	156,360	142,762
Income taxes	(62,272)	(59,851)	(56,004)
Net income	$ 99,195	$ 96,509	$ 86,758