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) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]        
Cash payments on derivative settlements, net $ 4,233 $ 4,545 $ 18,543 $ 6,855