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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 21, 2016	Mar. 11, 2016	Oct. 31, 2015	Aug. 31, 2015	Jun. 30, 2015	Jun. 09, 2015
Significant Accounting Policies [Line Items]
Debt instrument, subjective acceleration clause, period	30 days
Capitalized costs	$ 846,300	$ 1,526,484	$ 1,335,416
Maximum reserves sold from cost center not expected to result in significant alteration (less than)	25.00%
Natural gas balancing liability	$ 1,500	1,400
Advertising and promotional costs	700	1,300	5,100
Internal Costs
Significant Accounting Policies [Line Items]
Capitalized costs	$ 45,100	55,400	74,700
Buildings | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Buildings | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	39 years
Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Oil And Gas Unproved Properties
Significant Accounting Policies [Line Items]
Interest capitalized during period	$ 10,800	14,700	11,700
Midstream And Corporate Assets
Significant Accounting Policies [Line Items]
Interest capitalized during period	$ 3,300	$ 5,000	$ 4,900
8.125% Convertible Senior Notes due 2022
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate	8.125%
7.5% Convertible Senior Notes due 2023
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate	7.50%
Senior credit facility
Significant Accounting Policies [Line Items]
Line of credit facility, current borrowing capacity									$ 900,000
Secured Debt | 8.75% Senior Secured Notes Due 2020
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate	8.75%							8.75%
Convertible Debt | 8.125% Convertible Senior Notes due 2022
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate	8.125%	8.125%				8.125%	8.125%
Convertible Debt | 7.5% Convertible Senior Notes due 2023
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate	7.50%	7.50%				7.50%	7.50%
Restricted Stock Units
Significant Accounting Policies [Line Items]
Vesting period (in years)	4 years
June Amendment | Senior credit facility
Significant Accounting Policies [Line Items]
Line of credit facility, current borrowing capacity	$ 500,000
Subsequent Event | June Amendment | Senior credit facility
Significant Accounting Policies [Line Items]
Line of credit facility, current borrowing capacity					$ 340,000
Line of credit facility, target borrowing capacity				$ 500,000

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Line Of Credit Facility, Target Borrowing Capacity

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Significant Accounting Policies [Line Items]

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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