Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Intangible assets
Gross	$ 1,160,524	$ 1,076,571
Accumulated Amortization	(285,732)	(221,416)
Net	874,792	855,155
Estimated amortization expense
2014	63,908
2015	63,908
2016	63,908
2017	63,908
2018	63,908
Thereafter	555,252
Total estimated amortization expense	874,792	855,155
Marcellus
Intangible assets
Gross	304,708	304,708
Accumulated Amortization	(26,382)	(9,380)
Net	278,326	295,328
Useful Life	19 years
Northeast Segment
Intangible assets
Gross	102,473	102,473
Accumulated Amortization	(48,402)	(38,719)
Net	54,071	63,754
Useful Life	12 years
Southwest Segment
Intangible assets
Gross	753,343	669,390
Accumulated Amortization	(210,948)	(173,317)
Net	$ 542,395	$ 496,073
Southwest Segment | Maximum
Intangible assets
Useful Life	25 years
Southwest Segment | Minimum
Intangible assets
Useful Life	10 years