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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative instruments:        
Net fair value decrease, tax $ (2,197) $ (8,839) $ (5,710) $ (8,788)
Reclassification of gains to net income, tax $ (186) $ (233) $ (646) $ (691)