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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operations:      
Net income $ 24,285 $ 19,742 $ 16,267
Adjustments to reconcile net income to net cash flows from operating activities:      
Depreciation 57,531 51,916 53,069
Gain on disposition of revenue equipment (3,800) (1,110) (1,630)
Deferred income taxes 10,076 10,550 5,563
Tax benefits from share-based payment arrangement exercises 164 385 255
Excess tax benefits from share-based payment arrangement exercises (142) (338) (223)
Share-based payment arrangement compensation expense 1,349 1,264 586
Income before income taxes attributable to noncontrolling interest 807 631 584
Changes in other current operating items:      
Receivables 1,247 (14,246) 7,712
Prepaid expenses and other (2,020) (1,078) 1,377
Accounts payable (1,585) 348 3,519
Insurance and claims accruals (4,611) (1,569) (2,164)
Accrued liabilities 2,905 (1,973) (3,229)
Net cash provided by operating activities 86,206 64,522 81,686
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Purchases of marketable securities   (20) (113,170)
Sales of marketable securities 138   115,656
Net change in other assets (36) (6) 233
Net cash used for investing activities (48,271) (81,181) (77,164)
CASH FLOWS (USED FOR) PROVIDED BY FINANCING ACTIVITIES:      
Borrowings under credit facility and long-term debt 37,632 160,395 1,115
Repayment of borrowings under credit facility and long-term debt (56,978) (142,548) (2,473)
Dividends on common stock (1,758) (877)  
Issuance of common stock from share-based payment arrangement exercises 137 303 332
Excess tax benefits from share-based payment arrangement exercises 142 338 223
Change in net checks issued in excess of cash balances (1,066) (605) (136)
Noncontrolling interest distributions (529) (451) (568)
Net cash (used for) provided by financing activities (22,420) 16,555 (1,507)
NET CHANGE IN CASH AND CASH EQUIVALENTS 15,515 (104) 3,015
CASH AND CASH EQUIVALENTS:      
Beginning of year 5,306 5,410 2,395
End of year 20,821 5,306 5,410
Cash paid (received) for:      
Interest 36 225 200
Income taxes (2,559) 13,789 4,905
Non-cash investing activities:      
Change in property and equipment not yet paid for 1,499 253 (1,288)
Revenue Equipment [Member]
      
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Additions to property, plant, and equipment (75,332) (109,345) (104,842)
Buildings And Land, Office Equipment And Other [Member]
      
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Additions to property, plant, and equipment (9,573) (11,959) (7,948)
Revenue Equipment [Member]
      
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Proceeds from disposition of property, plant, and equipment 36,457 40,062 32,876
Buildings And Land, Office Equipment And Other [Member]
      
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Proceeds from disposition of property, plant, and equipment $ 75 $ 87 $ 31