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Derivative Activities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Accrued and other liabilities	$ 78,619	$ 79,045
Other non-current liabilities	11,857	12,911
Commodity Contract [Member] \| Oil And Natural Gas [Member]
Derivative [Line Items]
Accrued and other liabilities	100	0
Other non-current liabilities	$ 5,000	$ 5,000

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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