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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 306,276 | $ 454,433 | $ 434,288
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Allowance for credit losses | 4,200 | 9,868 | 11,914
Depreciation | 62,281 | 64,264 | 64,244
Amortization of cloud computing implementation costs | 18,399 | 3,624 | 0
Amortization of intangible assets | 1,219 | 1,361 | 1,705
Realized and unrealized (gains) losses from investments held in employee deferred compensation trusts | (66,866) | (44,492) | 22,343
Stock-based compensation | 52,486 | 48,300 | 44,953
Deferred income taxes | (13,146) | (9,473) | (15,885)
Changes in operating assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | 127,740 | (48,461) | (86,217)
Capitalized cloud computing implementation costs | (33,178) | (30,338) | 0
Accounts payable and accrued expenses | 1,098 | (9,204) | 32,428
Accrued payroll and benefit costs | 119,231 | 17,705 | 13,845
Employee deferred compensation plan obligations | 13,923 | 87,670 | 21,099
Income taxes payable | 182 | (18,798) | 28,900
Other assets and liabilities, net | 2,683 | (6,830) | (1,295)
Net cash flows provided by operating activities | 596,528 | 519,629 | 572,322
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Capital expenditures | (33,377) | (59,464) | (42,484)
Investments in employee deferred compensation trusts | (64,351) | (71,432) | (69,716)
Proceeds from employee deferred compensation trust redemptions | 123,025 | 28,758 | 23,691
Payments for acquisitions, net of cash acquired | (15,836) | 0 | 0
Net cash flows provided by (used in) investing activities | 9,461 | (102,138) | (88,509)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repayment of notes payable | (218) | (200) | (183)
Repurchases of common stock | (159,172) | (277,535) | (353,509)
Dividends paid | (155,935) | (145,631) | (136,423)
Net cash flows used in financing activities | (315,325) | (423,366) | (490,115)
Effect of exchange rate fluctuations | 13,284 | (226) | (11,872)
Change in cash and cash equivalents | 303,948 | (6,101) | (18,174)
Cash and cash equivalents at beginning of period | 270,478 | 276,579 | 294,753
Cash and cash equivalents at end of period | 574,426 | 270,478 | 276,579
Cash paid during the year for: |  |  |
Interest | 577 | 232 | 233
Income taxes, net of refunds | 128,321 | 191,522 | 137,147
Non-cash items: |  |  |
Stock repurchases awaiting settlement | 3,104 | 6,469 | 11,359
Fund exchanges within employee deferred compensation trusts | $ 208,055 | $ 41,648 | $ 79,300

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