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