Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Operating revenues, net	$ 135,976	$ 139,597	$ 255,616	$ 261,206
Gain on dispositions of assets, net	77	117	223	123
Other, principally interest income	93	5	636	36
Total	136,146	139,719	256,475	261,365
Expenses:
Direct expenses	120,443	116,101	228,649	220,308
Selling, general and administrative expenses	7,736	7,678	17,279	14,403
Interest expense	6,761	4,183	13,793	8,179
Expenses, total	134,940	127,962	259,721	242,890
Earnings (loss) before income taxes	1,206	11,757	(3,246)	18,475
Income tax expense (benefit)	483	4,703	(1,298)	7,390
Net earnings (loss)	$ 723	$ 7,054	$ (1,948)	$ 11,085
Weighted average shares outstanding:
Basic	15,312	15,312	15,312	15,312
Diluted	15,474	15,312	15,312	15,312
Net earnings (loss) per share:
Basic	$ 0.05	$ 0.46	$ (0.13)	$ 0.72
Diluted	$ 0.05	$ 0.46	$ (0.13)	$ 0.72