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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities: |  |  |
Net earnings | $ 592,016 | $ 619,790 | $ 490,383
Adjustments to reconcile net earnings to net cash from operating activities: |  |  |
(Recoveries) provisions for losses on accounts receivable | (1) | 3,808 | 5,356
Deferred income tax expense (benefit) | 4,482 | (12,031) | (43,695)
Stock compensation expense | 61,543 | 56,147 | 50,908
Depreciation and amortization | 50,950 | 54,019 | 49,310
Other, net | 941 | 647 | (4,382)
Changes in operating assets and liabilities: |  |  |
Decrease (increase) in accounts receivable | 265,919 | (214,971) | (184,771)
(Decrease) increase in accounts payable and accrued expenses | (181,987) | 86,036 | 114,631
Decrease (increase) in deferred contract costs | 28,811 | (42,097) |
(Decrease) increase in contract liabilities | (37,097) | 43,928 |
(Decrease) increase in income taxes payable, net | (18,472) | (19,691) | 16,264
Decrease (increase) in other, net | 4,830 | (2,781) | (5,365)
Net cash from operating activities | 771,935 | 572,804 | 488,639
Investing Activities: |  |  |
Purchase of property and equipment | (47,022) | (47,474) | (95,016)
Proceeds from sale of property and equipment | 579 | 215 | 84,405
Other, net | 428 | (1,140) | (1,074)
Net cash from investing activities | (46,015) | (48,399) | (11,685)
Financing Activities: |  |  |
Proceeds from issuance of common stock | 148,245 | 182,732 | 205,092
Repurchases of common stock | (389,060) | (647,898) | (478,258)
Dividends Paid | (170,553) | (156,840) | (150,495)
Payments for taxes related to net share settlement of equity awards | (6,674) | (3,248) |
Purchase of noncontrolling interest |  | (688) |
Distributions to noncontrolling interest |  | (1,796) | (904)
Net cash from financing activities | (418,042) | (627,738) | (424,565)
Effect of exchange rate changes on cash and cash equivalents | (1,122) | (24,031) | 24,275
Change in cash and cash equivalents | 306,756 | (127,364) | 76,664
Cash and cash equivalents at beginning of period | 923,735 | 1,051,099 | 974,435
Cash and cash equivalents at end of period | 1,230,491 | 923,735 | 1,051,099
Supplemental Cash Flow Information: |  |  |
Cash paid for income taxes | $ 222,083 | $ 239,255 | $ 249,704

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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