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Statements Of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 169,452,000 | $ 139,470,000 | $ 75,651,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 110,743,000 | 90,820,000 | 80,362,000
Loss on sale of property and equipment | 78,000 | 1,263,000 | 758,000
Deferred income taxes | 17,682,000 | 43,348,000 | 7,624,000
Changes in assets and liabilities |  |  |
Customer and other receivables, net | (5,410,000) | (40,414,000) | (36,169,000)
Prepaid expenses and other assets | (7,956,000) | (2,952,000) | (13,314,000)
Accounts payable | 2,795,000 | 12,875,000 | (4,247,000)
Compensation, benefits and other accrued liabilities | 13,559,000 | 17,626,000 | 22,476,000
Claims and insurance accruals | 7,458,000 | 6,696,000 | 3,831,000
Income taxes, net | 9,264,000 | 3,224,000 | (3,613,000)
Other liabilities | 10,391,000 | 5,978,000 | 7,163,000
Net cash provided by operating activities | 328,056,000 | 277,934,000 | 140,522,000
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (373,193,000) | (250,768,000) | (106,347,000)
Proceeds from sale of property and equipment | 12,018,000 | 5,436,000 | 2,604,000
Net cash used in investing activities | (361,175,000) | (245,332,000) | (103,743,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of long-term debt | 412,000 | 96,010,000 | 0
Principal payments under long-term debt agreements | (40,284,000) | (40,382,000) | (36,681,000)
Net (payments) proceeds on revolving line of credit | 10,000,000 | (66,230,000) | 1,183,000
Proceeds from stock issuance, net of issuance costs | 0 | 48,400,000 | 0
Other financing activities, net | (2,000) | 0 | (2,000)
Net cash (used in) provided by financing activities | (29,874,000) | 37,798,000 | (35,500,000)
(Decrease) increase in cash and cash equivalents | (62,993,000) | 70,400,000 | 1,279,000
Cash and cash equivalents at beginning of year | 75,850,000 | 5,450,000 | 4,171,000
Cash and cash equivalents at end of year | 12,857,000 | 75,850,000 | 5,450,000
Income taxes paid | 74,932,000 | 34,579,000 | 44,893,000
Interest paid | 13,728,000 | 14,011,000 | 13,561,000
Capitalized interest | 1,963,000 | 895,000 | 682,000
Supplemental disclosure of noncash investing and financing activities: |  |  |
Acquisition of property and equipment by capital lease | $ 1,094,000 | $ 8,570,000 | $ 1,183,000

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