Related Party Transaction (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
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
CONE [Member]
Related Party Transaction [Line Items]
Due from Related Parties	$ 4,267		$ 4,267		$ 5,448
Related Party Transaction, Expenses from Transactions with Related Party	14,382	6,301	26,207	14,781
CONE [Member] | Reimbursement for CONE Expenses [Member]
Related Party Transaction [Line Items]
Due from Related Parties	(478)		(478)		(2,168)
CONE [Member] | Reimbursement for Services Provided to Cone [Member]
Related Party Transaction [Line Items]
Due from Related Parties	(83)		(83)		(265)
CONE [Member] | CONE Capital Reimbursement [Member]
Related Party Transaction [Line Items]
Due from Related Parties	(283)		(283)		0
CONE [Member] | CONE Gathering Fees [Member]
Related Party Transaction [Line Items]
Due to Related Parties, Current	$ 5,111		$ 5,111		$ 7,881