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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
OPERATING ACTIVITIES: |  |
Net income | $ 49,168 | $ 37,951
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 13,260 | 9,277
Stock-based compensation | 46,899 | 36,926
Allowance for credit losses on accounts receivable | 2,384 | 843
Investment credit loss | 13 |
Noncash lease expense | 15,825 | 8,935
Deferred income taxes | (11,697) |
Other | (2,385) | (2,056)
Changes in operating assets and liabilities: |  |
Accounts receivable | 293,577 | 4,987
Prepaid expenses and other assets | (31,368) | (11,960)
Accounts payable | (214,396) | (28,952)
Accrued expenses and other liabilities | (7,535) | (6,312)
Operating lease liabilities | (4,735) | (5,848)
Net cash provided by operating activities | 149,010 | 43,791
INVESTING ACTIVITIES: |  |
Purchases of investments | (89,689) | (122,432)
Maturities of investments | 85,183 | 22,424
Purchases of property and equipment | (37,720) | (17,002)
Capitalized software development costs | (2,317) | (2,420)
Net cash used in investing activities | (44,543) | (119,430)
FINANCING ACTIVITIES: |  |
Proceeds from line of credit | 143,000 |
Repayment on line of credit | (1,000) |
Payment of debt financing costs |  | (7)
Proceeds from exercise of stock options | 41,695 | 16,975
Proceeds from employee stock purchase plan | 15,035 | 8,648
Taxes paid related to net settlement of restricted stock awards | (7,729) | (3,634)
Net cash provided by financing activities | 191,001 | 21,982
Increase (decrease) in cash and cash equivalents | 295,468 | (53,657)
Cash and cash equivalents—Beginning of period | 130,876 | 207,232
Cash and cash equivalents—End of period | 426,344 | 153,575
SUPPLEMENTAL CASH FLOW INFORMATION: |  |
Capitalized assets financed by accounts payable | 11,315 | 694
Tenant improvements paid by lessor |  | 413
Asset retirement obligation | 1,601 | 615
Stock-based compensation included in capitalized software development costs | 880 | 788
Cash paid for amounts included in the measurement of lease liabilities included in operating cash flows | 10,077 | 7,709
Right-of-use assets obtained in exchange for operating lease liabilities | $ 45,951 | $ 48,610

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