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Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets, Current [Abstract] |  |
Cash and cash equivalents | $ 12,857 | $ 75,850
Customer receivables, less allowances of $8,561 and $9,173, respectively | 219,039 | 213,481
Other receivables | 1,324 | 4,441
Prepaid expenses and other current assets | 21,754 | 18,614
Deferred income taxes | 20,054 | 19,466
Total current assets | 275,028 | 331,852
Property and equipment |  |
Revenue equipment | 922,030 | 789,984
Land and structures | 874,768 | 738,359
Other fixed assets | 225,298 | 214,816
Leasehold improvements | 6,128 | 5,773
Total property and equipment | 2,028,224 | 1,748,932
Less: Accumulated depreciation | (648,919) | (621,982)
Net property and equipment | 1,379,305 | 1,126,950
Goodwill | 19,463 | 19,463
Other assets | 38,718 | 34,809
Total assets | 1,712,514 | 1,513,074
Liabilities, Current [Abstract] |  |
Accounts Payable, Current | 44,891 | 42,096
Compensation and benefits | 80,047 | 66,740
Claims and insurance accruals | 33,990 | 35,934
Other accrued liabilities | 20,906 | 20,654
Income taxes payable | 6,327 | 32
Current maturities of long-term debt | 38,978 | 39,354
Total current liabilities | 225,139 | 204,810
Long-term debt | 201,429 | 229,831
Other non-current liabilities | 106,791 | 86,998
Deferred income taxes | 153,186 | 134,916
Total long-term liabilities | 461,406 | 451,745
Total liabilities | 686,545 | 656,555
Commitments and contingent liabilities |  |
Shareholders equity |  |
Common stock - $0.10 par value, 140,000,000 shares authorized, 86,164,917 and 86,164,986 shares outstanding at December 31, 2012 and 2011, respectively | 8,616 | 8,616
Capital in excess of par value | 134,401 | 134,403
Retained earnings | 882,952 | 713,500
Total shareholders' equity | 1,025,969 | 856,519
Total liabilities and shareholders' equity | $ 1,712,514 | $ 1,513,074

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- Definition The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31928-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31958-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31917-109318 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31931-109318 + Details
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