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Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net income | $ 139,470 | $ 75,651 | $ 34,871
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 90,820 | 80,362 | 94,784
Loss on sale of property and equipment | 1,263 | 758 | 173
Deferred income taxes | 43,348 | 7,624 | 10,778
Changes in assets and liabilities, net of acquisition effects: |  |  |
Customer and other receivables, net | (40,414) | (36,169) | 2,806
Prepaid expenses and other assets | (3,506) | (12,760) | (4,713)
Accounts payable | 12,875 | (4,247) | (7,531)
Compensation, benefits and other accrued liabilities | 17,626 | 22,476 | (10,746)
Claims and insurance accruals | 6,696 | 3,831 | 3,274
Income taxes, net | 3,224 | (3,613) | 2,812
Other liabilities | 5,978 | 7,163 | 4,208
Net cash provided by operating activities | 277,380 | 141,076 | 130,716
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (250,214) | (106,347) | (210,888)
Proceeds from sale of property and equipment | 5,436 | 2,050 | 2,303
Proceeds from sale of short-term investment securities | 0 | 0 | 4,861
Net cash used in investing activities | (244,778) | (104,297) | (203,724)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt | 96,010 | 0 | 0
Principal payments under long-term debt agreements | (40,382) | (36,681) | (11,972)
Net (payments) proceeds on revolving line of credit | (66,230) | 1,183 | 65,047
Proceeds from stock issuance, net of issuance costs | 48,400 | 0 | 0
Other financing activities, net | 0 | (2) | 0
Net cash provided by (used in) financing activities | 37,798 | (35,500) | 53,075
Increase (decrease) in cash and cash equivalents | 70,400 | 1,279 | (19,933)
Cash and cash equivalents at beginning of year | 5,450 | 4,171 | 24,104
Cash and cash equivalents at end of year | 75,850 | 5,450 | 4,171
Income taxes paid | 34,579 | 44,893 | 9,027
Interest paid | 14,011 | 13,561 | 14,708
Capitalized interest | 895 | 682 | 1,654
Supplemental disclosure of noncash investing and financing activities: |  |  |
Acquisition of property and equipment by capital lease | 8,570 | 1,183 | 468
Fair value of property exchanged | $ 0 | $ 544 | $ 1,277

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