Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (loss)	$ 6,065	$ (14,267)	$ 3,289
Other comprehensive income (loss):
Unrealized gain on effective portion of fuel hedges, net of tax of $2,100, $935, and $1,208 in 2012, 2011 and 2010, respectively	3,369	1,500	1,938
Reclassification of fuel hedge gains into statement of operations, net of tax of $1,932, $1,200, and $1,101 in 2012, 2011, and 2010, respectively	(3,099)	(1,926)	(1,767)
Total other comprehensive income (loss)	270	(426)	171
Comprehensive income (loss)	$ 6,335	$ (14,693)	$ 3,460