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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net income | $ 314,963 | $ 238,334 | $ 122,695
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 81,165 | 77,743 | 63,643
Amortization of deferred commissions costs | 53,421 | 48,313 | 0
Amortization of debt issuance costs | 876 | 876 | 2,303
Non-cash lease expense | 22,748 | 0 | 0
Loss on extinguishment of debt | 0 | 0 | 3,788
Loss on disposal of property and equipment | 105 | 73 | 129
Stock-based compensation expense | 52,255 | 41,214 | 39,030
Deferred income taxes, net | 8,220 | 3,666 | (2,903)
Bad debt expense | 10,978 | 6,542 | 5,690
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | (5,014) | (27,819) | (17,524)
Prepaid expenses and other current assets | (14,244) | (1,651) | (3,672)
Deferred commissions | (66,688) | (53,497) | 0
Income tax receivable | 0 | (1,927) | (12,981)
Accounts payable and other liabilities | 17,751 | (14,132) | 11,525
Lease liabilities | (25,442) | 0 | 0
Income taxes payable | (577) | 9,632 | 16,937
Deferred revenue | 7,911 | 7,879 | 6,004
Other assets | (648) | 212 | 39
Net cash provided by operating activities | 457,780 | 335,458 | 234,703
Investing activities: |  |  |
Purchases of property and equipment and other assets | (46,197) | (29,632) | (24,499)
Cash paid for acquisitions, net of cash acquired | (437,556) | (418,369) | (47,768)
Net cash used in investing activities | (483,753) | (448,001) | (72,267)
Financing activities: |  |  |
Payments of long-term debt | 0 | 0 | (345,000)
Payments of debt issuance costs | 0 | 0 | (3,467)
Repurchase of restricted stock to satisfy tax withholding obligations | (27,577) | (24,327) | (14,902)
Proceeds from equity offering, net of transaction costs | 0 | 0 | 833,911
Proceeds from exercise of stock options and employee stock purchase plan | 25,080 | 27,071 | 9,888
Other financing activities | (1,657) | 0 | 0
Net cash (used in) provided by financing activities | (4,154) | 2,744 | 480,430
Effect of foreign currency exchange rates on cash and cash equivalents | 442 | (1,248) | 1,374
Net (decrease) increase in cash and cash equivalents | (29,685) | (111,047) | 644,240
Cash and cash equivalents at beginning of year | 1,100,416 | 1,211,463 | 567,223
Cash and cash equivalents at end of year | 1,070,731 | 1,100,416 | 1,211,463
Supplemental cash flow disclosures: |  |  |
Interest paid | 1,998 | 1,421 | 6,445
Income taxes paid | 68,935 | 35,980 | 41,283
Supplemental non-cash investing and financing activities: |  |  |
Stock issued in connection with acquisition - ForRent | 0 | 36,366 | 0
Consideration owed for acquisitions | $ 1,650 | $ 1,534 | $ 0

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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