Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 60	$ 1,317
Accounts receivable, net	120,743	107,436
Prepaid expenses and other	29,215	34,063
Total current assets	150,018	142,816
Property and Equipment, at cost	700,132	669,345
Less-accumulated depreciation	342,987	344,890
Net property and equipment	357,145	324,455
Identifiable Intangibles, net	1,378	1,450
Other Noncurrent Assets	6,383	6,165
Total assets	514,924	474,886
Current Liabilities:
Accounts payable	54,307	39,783
Wages, vacation and employees' benefits	25,512	21,185
Other current liabilities	41,834	41,237
Current portion of long-term debt	22,143	22,143
Total current liabilities	143,796	124,348
Other Liabilities:
Long-term debt, less current portion	64,309	50,714
Deferred income taxes	51,289	51,289
Claims, insurance and other	29,954	29,234
Total other liabilities	145,552	131,237
Commitments and Contingencies
Stockholders' Equity:
Preferred stock, $0.001 par value, 50,000 shares authorized, none issued and outstanding
Common stock, $0.001 par value, 50,000,000 shares authorized, 15,993,881 and 15,937,821 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively	16	16
Additional paid-in-capital	204,555	203,793
Deferred compensation trust,140,644 and 139,324 shares of common stock at cost at March 31, 2012 and December 31, 2011, respectively	(2,221)	(2,199)
Retained earnings	23,226	17,691
Total stockholders' equity	225,576	219,301
Total liabilities and stockholders' equity	$ 514,924	$ 474,886