Derivative Financial Instruments - Cash Payments on Derivative Settlements, Net Included within Net Cash Provided by Operating Activities (Details)

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Derivative Financial Instruments - Cash Payments on Derivative Settlements, Net Included within Net Cash Provided by Operating Activities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2014 USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Cash payments on derivative settlements, net	$ 14,310