Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenue	$ 130,645	$ 135,010	$ 398,909	$ 409,552
Operating Expenses
Salaries, wages, and benefits	39,556	40,899	121,093	125,857
Rent and purchased transportation	1,112	1,495	3,735	4,752
Fuel	39,261	42,443	120,876	126,259
Operations and maintenance	4,987	6,468	14,256	18,371
Operating taxes and licenses	1,972	2,122	6,856	6,445
Insurance and claims	2,016	4,832	9,620	11,297
Communications and utilities	767	756	2,239	2,249
Depreciation	15,117	14,250	47,112	42,184
Other operating expenses	4,334	3,752	11,839	11,379
Gain on disposal of property and equipment	(4,477)	(1,674)	(24,299)	(9,433)
Total operating expenses	104,645	115,343	313,327	339,360
Operating income	26,000	19,667	85,582	70,192
Interest income	126	191	378	500
Income before income taxes	26,126	19,858	85,960	70,692
Federal and state income taxes	10,258	7,424	31,220	23,443
Net income	15,868	12,434	54,740	47,249
Other comprehensive income, net of tax	454	0	1,054	1,797
Comprehensive income	$ 16,322	$ 12,434	$ 55,794	$ 49,046
Net income per share
Basic	$ 0.19	$ 0.15	$ 0.65	$ 0.55
Diluted	$ 0.19	$ 0.14	$ 0.64	$ 0.55
Weighted average shares outstanding
Basic	84,837	85,646	84,799	86,189
Diluted	85,038	85,925	85,041	86,508
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06