Quarterly report pursuant to Section 13 or 15(d)

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