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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 282,810 | $ 245,368 | $ 181,848
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 24,129 | 18,989 | 16,005
Amortization | 2,199 | 3,352 | 5,114
Stock-based compensation expense | 20,516 | 21,412 | 14,469
Noncash lease expense | 19,646 | 18,015 | 16,288
Deferred income tax benefit | (25,117) | (23,014) | (37,112)
Other | 2,705 | (2,127) | 8
Changes in assets and liabilities: |  |  |
Accounts receivable and unbilled, net | (48,282) | (66,920) | (24,982)
Prepaid expenses and other current assets | 2,986 | (10,175) | (9,134)
Accounts payable | 1,051 | 6,431 | 1,866
Accrued expenses | 82,080 | 52,476 | 26,156
Advanced billings | 97,131 | 118,088 | 88,977
Lease liabilities | (18,873) | (15,899) | (15,632)
Other assets and liabilities, net | (9,607) | 22,054 | (544)
Net cash provided by operating activities | 433,374 | 388,050 | 263,327
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Property and equipment expenditures | (36,648) | (36,879) | (28,271)
Other | 2,019 | (1,863) | (3,093)
Net cash used in investing activities | (34,629) | (38,742) | (31,364)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from stock option exercises | 11,378 | 22,074 | 17,643
Repurchases of common stock | (144,020) | (847,849) | (62,096)
Proceeds from revolving loan | 105,000 | 324,200 | 0
Payments on revolving loan | (155,000) | (274,200) | 0
Net cash used in financing activities | (182,642) | (775,775) | (44,453)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 1,081 | (6,572) | (3,972)
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 217,184 | (433,039) | 183,538
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period | 28,265 | 461,304 | 277,766
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period | 245,449 | 28,265 | 461,304
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION— |  |  |
Cash paid during the period for income taxes | 76,353 | 50,164 | 56,243
Cash paid during the period for interest | 3,056 | 2,935 | 123
Acquisition of property and equipment—non-cash | $ 5,254 | $ 7,838 | $ 6,352

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