Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive (Loss) Income (Parenthetical)

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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Change in fair value of derivative instruments, tax $ 0 $ 400,000 $ 0 $ (300,000)
Reclassification of settled contracts, tax $ 0 $ 1,000,000 $ 0 $ 3,000,000