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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
OPERATING ACTIVITIES |  |  |
Net income | $ 274,436 | $ 296,381 | $ 146,742
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, amortization and other non-cash charges | 214,153 | 179,787 | 133,253
Stock-based compensation expense | 7,860 | 8,075 | 4,909
Loss (gain) on disposition of assets, net | 6,099 | 3,831 | (3,758)
Deferred income tax provision | 4,821 | 77,074 | 22,262
Excess tax benefits for share-based payments | (2,724) | (3,371) | (651)
Changes in current assets and liabilities: |  |  |
Accounts receivable | 73,809 | (167,312) | (163,162)
Income taxes receivable | 9,295 | 9,817 | 1,584
Inventories | (40,354) | (36,511) | (8,130)
Prepaid expenses | (2,284) | (2,783) | (1,041)
Other current assets | 26,189 | (30,524) | 189
Accounts payable | (4,929) | 30,102 | 14,191
Income taxes payable | (4,277) | 4,917 | 5,141
Accrued payroll and related expenses | (1,627) | 9,799 | 13,173
Accrued insurance expenses | 408 | 603 | 826
Accrued state, local and other taxes | 2,260 | 2,078 | 987
Other accrued expenses | 1,412 | 958 | 112
Changes in working capital | 59,902 | (178,856) | (136,130)
Changes in other assets and liabilities: |  |  |
Pension liabilities | (589) | 1,249 | 1,628
Accrued insurance expenses | 1,400 | 511 | (108)
Other non-current assets | (6,415) | 294 | (920)
Other non-current liabilities | 990 | 1,032 | 1,430
Net cash provided by operating activities | 559,933 | 386,007 | 168,657
INVESTING ACTIVITIES |  |  |
Capital expenditures | (328,936) | (416,400) | (187,486)
Increased ownership interest in subsidiary | (6,211) |  |
Proceeds from sale of assets | 19,309 | 24,763 | 15,717
Net cash used for investing activities | (315,838) | (391,637) | (171,769)
FINANCING ACTIVITIES |  |  |
Payment of dividends | (114,069) | (47,327) | (20,647)
Borrowings from notes payable to banks | 844,050 | 940,850 | 516,600
Repayments of notes payable to banks | (940,350) | (858,800) | (485,650)
Debt issue costs for notes payable to banks |  | (415) | (1,886)
Excess tax benefits for share-based payments | 2,724 | 3,371 | 651
Cash paid for common stock purchased and retired | (30,224) | (34,419) | (1,650)
Proceeds received upon exercise of stock options | 544 | 728 | 240
Net cash (used for) provided by financing activities | (237,325) | 3,988 | 7,658
Net increase (decrease) in cash and cash equivalents | 6,770 | (1,642) | 4,546
Cash and cash equivalents at beginning of year | 7,393 | 9,035 | 4,489
Cash and cash equivalents at end of year | $ 14,163 | $ 7,393 | $ 9,035

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