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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 53,058 | $ 46,653
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 5,127 | 3,973
Amortization | 3,977 | 8,839
Stock-based compensation expense | 8,061 | 8,568
Amortization of debt issuance costs and discount | 0 | 874
Noncash lease expense | 6,288 | 4,787
Deferred income tax provision | 2,416 | 1,840
Amortization and adjustment of deferred credit | (356) | (400)
Other | (265) | 10
Changes in assets and liabilities: |  |
Accounts receivable and unbilled, net | 28,524 | (15,470)
Prepaid expenses and other current assets | (860) | (3,414)
Accounts payable | (7,173) | 5,338
Accrued expenses | (5,933) | 6,066
Advanced billings | 3,094 | 17,546
Lease liabilities | (4,933) | (4,338)
Other assets and liabilities, net | 2,390 | (237)
Net cash provided by operating activities | 93,415 | 80,635
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Property and equipment expenditures | (14,885) | (5,990)
Other | 48 | (1,292)
Net cash used in investing activities | (14,837) | (7,282)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from stock option exercises | 1,976 | 3,891
Repurchases of common stock | (50,827) | 0
Payment of debt | 0 | (80,438)
Net cash used in financing activities | (48,851) | (76,547)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | (744) | 10
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 28,983 | (3,184)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period | 131,920 | 23,282
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period | 160,903 | 20,098
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION— |  |
Acquisition of property and equipment—non-cash | $ 11,697 | $ 2,167

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