Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 10,716	$ 29,045
Accounts receivable, net	114,661	94,569
Prepaid expenses and other	30,019	29,882
Total current assets	155,396	153,496
Property and Equipment, at cost	632,669	610,572
Less-accumulated depreciation	335,177	319,634
Net property and equipment	297,492	290,938
Identifiable Intangibles, net	1,645	1,840
Other Noncurrent Assets	5,616	5,883
Total assets	460,149	452,157
Current Liabilities:
Accounts payable	41,146	37,745
Wages, vacation and employees' benefits	22,937	19,101
Other current liabilities	31,945	31,777
Current portion of long-term debt	19,643	17,143
Total current liabilities	115,671	105,766
Other Liabilities:
Long-term debt, less current portion	61,786	72,857
Deferred income taxes	42,077	39,077
Claims, insurance and other	29,239	28,099
Total other liabilities	133,102	140,033
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, $0.001 par value, 50,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value, 50,000,000 shares authorized, 15,927,231 and 15,900,245 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	16	16
Additional paid-in-capital	203,153	202,751
Deferred compensation trust, 135,929 and 169,344 shares of common stock at cost at June 30, 2011 and December 31, 2010, respectively	(2,182)	(2,727)
Retained earnings	10,389	6,318
Total stockholders' equity	211,376	206,358
Total liabilities and stockholders' equity	$ 460,149	$ 452,157