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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Fair Value Measurements (Debt) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Asset Impairment Charges
Impairment charges for gas gathering and processing equipment	$ 800	$ 0	$ 800	$ 1,700
Impairment charges related to write-down of inventory	900		900
Carrying Value \| New Revolving Credit Facility
Fair value and carrying value of long-term debt
Debt value	875,828		875,828		$ 545,000
Carrying Value \| Term Loan Facility
Fair value and carrying value of long-term debt
Debt value	700,000		700,000		696,916
Carrying Value \| 2017 Senior Notes
Fair value and carrying value of long-term debt
Debt value	350,000		350,000		348,669
Carrying Value \| 2019 Senior Notes
Fair value and carrying value of long-term debt
Debt value	577,914		577,914		293,064
Carrying Value \| 2020 Senior Notes
Fair value and carrying value of long-term debt
Debt value	222,087		222,087		105,234
Fair Value \| New Revolving Credit Facility
Fair value and carrying value of long-term debt
Debt value	875,828		875,828		512,414
Fair Value \| Term Loan Facility
Fair value and carrying value of long-term debt
Debt value	151,375		151,375		653,798
Fair Value \| 2017 Senior Notes
Fair value and carrying value of long-term debt
Debt value	23,230		23,230		190,400
Fair Value \| 2019 Senior Notes
Fair value and carrying value of long-term debt
Debt value	67,183		67,183		184,932
Fair Value \| 2020 Senior Notes
Fair value and carrying value of long-term debt
Debt value	$ 32,758		$ 32,758		$ 73,311