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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 | $ 209,942 | $ 149,922 | $ 66,069
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of intangible assets | 398 | 153 | 411
Depreciation expense | 48,326 | 51,262 | 55,547
Stock-based compensation expense-restricted stock and stock units | 41,464 | 50,906 | 56,949
Stock-based compensation expense-stock options |  |  | 170
Excess tax benefits from stock-based compensation | (8,475) | (4,211) | (5,814)
Deferred income taxes | (14,993) | 17,156 | 7,370
Provision for doubtful accounts receivable | 7,133 | 6,673 | 6,795
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Increase in accounts receivable | (21,354) | (81,314) | (68,008)
Increase in accounts payable, accrued expenses, accrued payroll costs and retirement obligations | 16,672 | 64,932 | 41,626
Increase in income taxes payable | 15,160 | 6,368 | 1,490
Change in other assets, net of change in other liabilities | (5,096) | (5,531) | 13,278
Net cash flows provided by operating activities | 289,177 | 256,316 | 175,883
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Payment for acquisitions, net of cash acquired | (14,393) |  | (585)
Capital expenditures | (50,056) | (56,535) | (35,088)
Increase in trusts for employee benefits and retirement plans | (8,577) | (6,867) | (3,424)
Net cash flows used in investing activities | (73,026) | (63,402) | (39,097)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repurchases of common stock | (176,794) | (168,103) | (155,460)
Cash dividends paid | (84,129) | (80,303) | (76,591)
Decrease in notes payable and other indebtedness | (107) | (91) | (113)
Excess tax benefits from stock-based compensation | 8,475 | 4,211 | 5,814
Proceeds from exercises of stock options | 42,939 | 18,309 | 38,355
Net cash flows used in financing activities | (209,616) | (225,977) | (187,995)
Effect of exchange rate changes on cash and cash equivalents | 1,764 | (2,738) | 552
Net increase (decrease) in cash and cash equivalents | 8,299 | (35,801) | (50,657)
Cash and cash equivalents at beginning of period | 279,336 | 315,137 | 365,794
Cash and cash equivalents at end of period | 287,635 | 279,336 | 315,137
Cash paid during the year for: |  |  |
Interest | 405 | 536 | 599
Income taxes, net of refunds | 136,023 | 76,422 | 38,249
Non-cash items: |  |  |
Stock repurchases awaiting settlement | $ 5,942 | $ 2,466 |

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