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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Operating activities |  |
Net income | $ 48,891 | $ 64,022
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 26,475 | 21,508
Amortization of other intangible assets | 16,948 | 16,795
Acquisition-related contingent consideration | (2,581) | 2,538
Provision for doubtful accounts | 9,387 | 9,483
Non-cash share-based compensation | 24,465 | 29,043
Excess tax benefits from share-based compensation | (98) | (198)
Non-cash interest expense | 4,505 | 6,322
Other | 108 | (559)
Changes in operating assets and liabilities, net of effects from acquisitions: |  |
Accounts receivable, billed and unbilled | (62,466) | (130,132)
Notes receivable | (20,732) | (4,914)
Prepaid expenses and other assets | (3,701) | (3,670)
Accounts payable, accrued expenses and other | 5,608 | 14,489
Income taxes | (5,595) | 1,061
Accrued compensation | (33,734) | 21,098
Billings in excess of services provided | 6,144 | (38)
Net cash provided by operating activities | 13,624 | 46,848
Investing activities |  |
Payments for acquisition of businesses, net of cash received | (26,453) | (62,346)
Purchases of property and equipment | (20,534) | (24,595)
Other | (1,105) | (127)
Net cash used in investing activities | (48,092) | (87,068)
Financing activities |  |
Borrowings under revolving line of credit | 75,000 | 25,000
Payments of revolving line of credit |  | (25,000)
Payments of long-term debt and capital lease obligations | (156,487) | (6,967)
Purchase and retirement of common stock | (20,013) | (209,400)
Net issuance of common stock under equity compensation plans | 523 | 797
Excess tax benefits from share-based compensation | 98 | 198
Other | (2,080) | (1)
Net cash used in financing activities | (102,959) | (215,373)
Effect of exchange rate changes on cash and cash equivalents | (68) | (747)
Net decrease in cash and cash equivalents | (137,495) | (256,340)
Cash and cash equivalents, beginning of period | 264,423 | 384,570
Cash and cash equivalents, end of period | 126,928 | 128,230
Supplemental cash flow disclosures |  |
Cash paid for interest | 31,343 | 31,725
Cash paid for income taxes, net of refunds | 31,968 | 33,443
Non-cash investing and financing activities: |  |
Issuance of stock units under incentive compensation plans | $ 3,079 | $ 4,241

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