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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Operating activities |  |
Net income | $ 23,680 | $ 18,431
Adjustments to reconcile net income to net cash used in operating activities: |  |
Depreciation and amortization | 8,006 | 7,496
Amortization of other intangible assets | 5,564 | 5,517
Acquisition-related contingent consideration | 731 | 557
Provision for doubtful accounts | 4,094 | 4,569
Non-cash share-based compensation | 10,055 | 10,553
Excess tax benefits from share-based compensation | (124) | (55)
Non-cash interest expense | 670 | 1,933
Other | (11) | 73
Changes in operating assets and liabilities, net of effects from acquisitions: |  |
Accounts receivable, billed and unbilled | (47,711) | (21,996)
Notes receivable | (227) | (14,481)
Prepaid expenses and other assets | 531 | (7,735)
Accounts payable, accrued expenses and other | 16,603 | 17,694
Income taxes | 2,937 | (15,627)
Accrued compensation | (28,862) | (67,079)
Billings in excess of services provided | 1,760 | 2,329
Net cash used in operating activities | (2,304) | (57,821)
Investing activities |  |
Payments for acquisition of businesses, net of cash received | (14,676) | (18,595)
Purchases of property and equipment | (7,323) | (4,756)
Other | 12 | 16
Net cash used in investing activities | (21,987) | (23,335)
Financing activities |  |
Payments of long-term debt and capital lease obligations |  | (156)
Purchase and retirement of common stock | (28,758) |
Net issuance of common stock under equity compensation plans | (1,335) | (647)
Excess tax benefits from share-based compensation | 124 | 55
Other | (224) | (370)
Net cash provided by (used in) financing activities | (30,193) | (1,118)
Effect of exchange rate changes on cash and cash equivalents | (1,598) | 289
Net decrease in cash and cash equivalents | (56,082) | (81,985)
Cash and cash equivalents, beginning of period | 156,785 | 264,423
Cash and cash equivalents, end of period | 100,703 | 182,438
Supplemental cash flow disclosures |  |
Cash paid for interest | 321 | 2,864
Cash paid for income taxes, net of refunds | 6,970 | 26,222
Non-cash investing and financing activities: |  |
Issuance of stock units under incentive compensation plans | $ 2,825 | $ 3,079

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