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Consolidated 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 | $ 149,922 | $ 66,069 | $ 37,263
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of intangible assets | 153 | 411 | 1,460
Depreciation expense | 51,262 | 55,547 | 63,806
Stock-based compensation expense-restricted stock and stock units | 50,906 | 56,949 | 60,320
Stock-based compensation expense-stock options |  | 170 | 828
Excess tax benefits from stock-based compensation | (4,211) | (5,814) | (4,751)
Provision for deferred income taxes | 17,156 | 7,370 | 5,752
Provision for doubtful accounts receivable | 6,673 | 6,795 | (839)
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
(Increase) decrease in accounts receivable | (81,314) | (68,008) | 133,541
Increase (decrease) in accounts payable, accrued expenses, accrued payroll costs and retirement obligations | 64,932 | 41,626 | (52,210)
Increase (decrease) in income taxes payable | 6,368 | 1,490 | (3,830)
Change in other assets, net of change in other liabilities | (5,531) | 13,278 | (1,187)
Net cash flows provided by operating activities | 256,316 | 175,883 | 240,153
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Payment for acquisitions, net of cash acquired |  | (585) |
Capital expenditures | (56,535) | (35,088) | (41,248)
Increase in trusts for employee benefits and retirement plans | (6,867) | (3,424) | (4,719)
Net cash flows used in investing activities | (63,402) | (39,097) | (45,967)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repurchases of common stock | (168,103) | (155,460) | (149,818)
Cash dividends paid | (80,303) | (76,591) | (72,149)
Decrease in notes payable and other indebtedness | (91) | (113) | (105)
Excess tax benefits from stock-based compensation | 4,211 | 5,814 | 4,751
Proceeds from exercises of stock options | 18,309 | 38,355 | 24,951
Net cash flows used in financing activities | (225,977) | (187,995) | (192,370)
Effect of exchange rate changes on cash and cash equivalents | (2,738) | 552 | 9,222
Net (decrease) increase in cash and cash equivalents | (35,801) | (50,657) | 11,038
Cash and cash equivalents at beginning of period | 315,137 | 365,794 | 354,756
Cash and cash equivalents at end of period | 279,336 | 315,137 | 365,794
Cash paid during the year for: |  |  |
Interest | 536 | 599 | 441
Income taxes, net of refunds | 76,422 | 38,249 | 21,759
Non-cash items: |  |  |
Stock repurchases awaiting settlement | $ 2,466 |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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