Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Comprehensive Income (Parenthetical)

v2.4.0.8
Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Comprehensive Income [Abstract]      
Change in fair value of derivative instruments, tax $ 4,300,000 $ (4,300,000) $ 0
Reclassification of settled contracts, tax $ (500,000) $ 500,000 $ 0