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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Operating activities |  |
Net income | $ 50,139 | $ 98,735
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization of property, equipment and internal-use software | 28,175 | 23,003
Amortization of intangible assets | 14,231 | 16,349
Provision for uncollectible overdrawn accounts from purchase transactions | 4,398 | 4,047
Stock-based compensation | 24,987 | 23,242
Losses in equity method investment | 2,716 | 0
Realized gain on sale of available-for-sale investment securities | (5,062) | 0
Amortization of premium (discount) on available-for-sale investment securities | 432 | (224)
Amortization of deferred financing costs | 84 | 1,124
Impairment of internal-use software | 1,068 | 104
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 8,583 | 8,696
Prepaid expenses and other assets | 9,285 | 8,051
Deferred expenses | 9,981 | 13,634
Accounts payable and other accrued liabilities | 13,665 | (31,207)
Deferred revenue | (15,096) | (18,799)
Income tax receivable/payable | 15,407 | 20,929
Other, net | (1,477) | (616)
Net cash provided by operating activities | 161,516 | 167,068
Investing activities |  |
Purchases of available-for-sale investment securities | (208,502) | (90,216)
Proceeds from maturities of available-for-sale securities | 61,717 | 50,354
Proceeds from sales of available-for-sale securities | 187,668 | 101
Payments for acquisition of property and equipment | (31,395) | (37,746)
Net changes in loans | 1,612 | (1,296)
Investment in TailFin Labs, LLC | (35,000) | 0
Other | (832) | 0
Net cash used in investing activities | (24,732) | (78,803)
Financing activities |  |
Repayments of borrowings from notes payable | 0 | (60,000)
Borrowings on revolving line of credit | 100,000 | 0
Repayments on revolving line of credit | (135,000) | 0
Proceeds from exercise of options and ESPP purchases | 4,858 | 4,836
Taxes paid related to net share settlement of equity awards | (2,985) | (16,874)
Net increase in deposits | 826,203 | 140,110
Net decrease in obligations to customers | (56,603) | (48,306)
Contingent consideration payments | (2,000) | (2,634)
Repurchase of Class A common stock | 0 | (100,000)
Net cash provided by (used in) financing activities | 734,473 | (82,868)
Net increase in unrestricted cash, cash equivalents and restricted cash | 871,257 | 5,397
Unrestricted cash, cash equivalents and restricted cash, beginning of period | 1,066,154 | 1,095,218
Unrestricted cash, cash equivalents and restricted cash, end of period | 1,937,411 | 1,100,615
Cash paid for interest | 759 | 1,604
Cash paid for income taxes | 34 | 3,702
Total unrestricted cash, cash equivalents and restricted cash, end of period | $ 1,937,411 | $ 1,100,615

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