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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities: |  |  |
Net earnings | $ 1,418,845 | $ 698,214 | $ 592,016
Adjustments to reconcile net earnings to net cash from operating activities: |  |  |
Provisions for losses (recoveries) on accounts receivable | 7,540 | 5,584 | (1)
Deferred income tax (benefit) expense | (3,690) | 8,371 | 4,482
Stock compensation expense | 69,385 | 62,498 | 61,543
Depreciation and amortization | 51,312 | 56,959 | 50,950
Other, net | 3,790 | 3,960 | 941
Changes in operating assets and liabilities: |  |  |
(Increase) decrease in accounts receivable | (1,869,827) | (647,193) | 265,919
Increase (decrease) in accounts payable and accrued expenses | 1,041,805 | 430,452 | (182,233)
(Increase) decrease in deferred contract costs | (700,273) | (189,447) | 28,811
Increase (decrease) in contract liabilities | 803,837 | 217,699 | (37,097)
Increase (decrease) in income taxes payable, net | 57,867 | 8,502 | (18,472)
(Increase) decrease in other, net | (12,097) | (630) | 4,830
Net cash from operating activities | 868,494 | 654,969 | 771,689
Investing Activities: |  |  |
Purchase of property and equipment | (36,247) | (47,543) | (47,022)
Other, net | (398) | 1,516 | 1,007
Net cash from investing activities | (36,645) | (46,027) | (46,015)
Financing Activities: |  |  |
Proceeds from borrowing on lines of credit, net | 7,512 | 43 | 246
Proceeds from issuance of common stock | 106,105 | 186,345 | 148,245
Repurchases of common stock | (514,594) | (332,387) | (389,060)
Dividends paid | (195,766) | (174,929) | (170,553)
Payments for taxes related to net share settlement of equity awards | (15,172) | (10,566) | (6,674)
Distribution to noncontrolling interest | (1,631) | 0 | 0
Net cash from financing activities | (613,546) | (331,494) | (417,796)
Effect of exchange rate changes on cash and cash equivalents | (17,402) | 19,852 | (1,122)
Change in cash and cash equivalents | 200,901 | 297,300 | 306,756
Cash and cash equivalents at beginning of period | 1,527,791 | 1,230,491 | 923,735
Cash and cash equivalents at end of period | 1,728,692 | 1,527,791 | 1,230,491
Supplemental Cash Flow Information: |  |  |
Cash paid for income taxes | $ 442,549 | $ 239,849 | $ 222,083

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