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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