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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 103,034 | $ 102,757 | $ 80,039
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 166,957 | 158,634 | 152,242
Deferred income taxes | (9,068) | 57,863 | (11,921)
Gain on disposal of property and equipment | (20,533) | (21,290) | (5,907)
Stock-based compensation | 4,602 | 2,599 | 1,461
Insurance and claims accruals, net of current portion | 4,250 | 8,000 | (250)
Other | (237) | (1,073) | 592
Changes in certain working capital items: |  |  |
Accounts receivable, net | 7,579 | (28,448) | (9,524)
Other current assets | 17,581 | (21,744) | (1,218)
Accounts payable | (20,172) | 19,381 | 10,839
Other current liabilities | 1,103 | (12,199) | 12,130
Net cash provided by operating activities | 255,096 | 264,480 | 228,483
Cash flows from investing activities: |  |  |
Additions to property and equipment | (284,942) | (302,340) | (176,057)
Retirements of property and equipment | 60,015 | 70,142 | 57,024
Decrease in notes receivable | 8,122 | 7,354 | 4,699
Net cash used in investing activities | (216,805) | (224,844) | (114,334)
Cash flows from financing activities: |  |  |
Repayments of short-term debt | (160,000) | (50,000) | (50,000)
Proceeds from issuance of short-term debt | 180,000 | 50,000 | 50,000
Proceeds from issuance of long-term debt | 70,000 | 0 | 0
Change in net checks issued in excess of cash balances | (6,671) | 6,671 | 0
Dividends on common stock | (124,391) | (50,969) | (130,676)
Tax withholding related to net share settlements of restricted stock awards | (674) | 0 | 0
Stock options exercised | 6,035 | 2,940 | 7,980
Excess tax benefits from stock-based compensation | 150 | 605 | 3,422
Net cash used in financing activities | (35,551) | (40,753) | (119,274)
Effect of exchange rate fluctuations on cash | 276 | (437) | 661
Net increase (decrease) in cash and cash equivalents | 3,016 | (1,554) | (4,464)
Cash and cash equivalents, beginning of period | 12,412 | 13,966 | 18,430
Cash and cash equivalents, end of period | 15,428 | 12,412 | 13,966
Supplemental disclosures of cash flow information: |  |  |
Interest paid | 245 | 85 | 47
Income taxes paid | 67,968 | 28,802 | 56,050
Supplemental schedule of non-cash investing activities: |  |  |
Notes receivable issued upon sale of property and equipment | 10,564 | 9,172 | 4,607
Property and equipment acquired included in accounts payable | 109 | 17,026 | 629
Property and equipment disposed included in other receivables | $ 311 | $ 258 | $ 573

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