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Consolidated Condensed Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income (loss) $ 4,251 $ 1,655 $ 3,611 $ (809)
Other comprehensive income (loss):        
Unrealized gain (loss) on effective portion of fuel hedge, net of tax of $274 and $158 in 2012 and $194 and $441 in 2011, respectively 713 506 (412) 1,149
Reclassification of fuel hedge gain into statement of operations, net of tax of $228 and $596 in 2012 and $339 and $511 in 2011, respectively (594) (862) (1,551) (1,322)
Total other comprehensive income (loss) 119 (356) (1,963) (173)
Comprehensive income (loss) $ 4,370 $ 1,299 $ 1,648 $ (982)