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Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 54,219 $ 75,850
Customer receivables, less allowances of $9,114 and $9,173, respectively 228,398 213,481
Other receivables 2,252 4,441
Prepaid expenses 23,381 18,614
Deferred income taxes 19,650 19,466
Total current assets 327,900 331,852
Property and equipment:    
Revenue equipment 833,599 789,984
Land and structures 767,513 738,359
Other fixed assets 213,548 214,816
Leasehold improvements 5,827 5,773
Total property and equipment 1,820,487 1,748,932
Accumulated depreciation (630,350) (621,982)
Net property and equipment 1,190,137 1,126,950
Goodwill 19,463 19,463
Other assets 36,692 34,809
Total assets 1,574,192 1,513,074
Current liabilities:    
Accounts payable 54,677 42,096
Compensation and benefits 69,614 66,740
Claims and insurance accruals 38,040 35,934
Other accrued liabilities 49,851 20,686
Current maturities of long-term debt 39,086 39,354
Total current liabilities 251,268 204,810
Long-term liabilities:    
Long-term debt 219,117 229,831
Other non-current liabilities 94,836 86,998
Deferred income taxes 121,357 134,916
Total long-term liabilities 435,310 451,745
Commitments and contingent liabilities 0 0
Total liabilities 686,578 656,555
Shareholders' equity:    
Common stock - $0.10 par value, 70,000,000 shares authorized, 57,443,324 shares outstanding at March 31, 2012 and December 31, 2011 5,744 5,744
Capital in excess of par value 137,275 137,275
Retained earnings 744,595 713,500
Total shareholders' equity 887,614 856,519
Total liabilities and shareholders' equity $ 1,574,192 $ 1,513,074