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Segment Information (Reconciliation Of Adjusted Net Income To Net Income) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Segment Information        
Adjusted net income $ 35,545 $ 26,792 $ 64,711 $ 50,466
Unrealized gains (losses) on fuel price derivatives 13,875 6,533 (6,943) (287)
Amortization of acquired intangible assets (5,379) (1,343) (10,944) (2,715)
Tax impact (3,426) (1,946) 5,906 1,126
Net income $ 40,615 $ 30,036 $ 52,730 $ 48,590