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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 842 $ 159
Accounts receivable, net 141,917 117,937
Prepaid expenses and other 43,609 52,157
Total current assets 186,368 170,253
Property and Equipment, at cost 820,386 797,527
Less-accumulated depreciation 377,108 365,301
Net property and equipment 443,278 432,226
Goodwill and Identifiable Intangibles, net 8,635 8,789
Other Noncurrent Assets 5,564 5,533
Total assets 643,845 616,801
Current Liabilities:    
Accounts payable 66,098 50,799
Wages, vacation and employees' benefits 29,816 35,248
Other current liabilities 52,812 47,667
Current portion of long-term debt 7,143 7,143
Total current liabilities 155,869 140,857
Other Liabilities:    
Long-term debt, less current portion 72,576 69,740
Deferred income taxes 68,612 69,916
Claims, insurance and other 32,054 31,496
Total other liabilities 173,242 171,152
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, 24,662,205 and 24,478,544 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively 25 24
Additional paid-in-capital 215,002 213,648
Deferred compensation trust, 197,699 and 201,936 shares of common stock at cost at March 31, 2014 and December 31, 2013, respectively (2,235) (2,246)
Retained earnings 101,942 93,366
Total stockholders' equity 314,734 304,792
Total liabilities and stockholders' equity $ 643,845 $ 616,801