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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |
Net (loss) income | $ (61,373) | $ (90,433) | $ 10,617
Adjustments to reconcile net (loss) income to cash (used in) provided by operating activities |  |  |
Stock-based compensation | 103,068 | 80,909 | 63,862
(Gain) loss on capped call transactions | (31,697) | 0 | 0
Deferred income taxes | (59,777) | (49,317) | (30,898)
Amortization of deferred commissions | 33,302 | 29,152 | 17,271
Lease expense | 16,248 | 14,497 |
Amortization of debt discount and issuance costs | 14,813 | 0 | 0
Amortization of intangible assets and depreciation | 21,348 | 21,396 | 25,295
Amortization of investments | 1,073 | 800 | 1,596
Foreign currency transaction (gain) loss | (3,704) | 2,335 | (2,421)
Other non-cash | (879) | (521) | (1,678)
Change in operating assets and liabilities: |  |  |
Accounts receivable, unbilled receivables, and contract assets | (32,321) | 1,088 | 25,779
Other current assets | (12,959) | (6,344) | (6,068)
Accounts payable, accrued compensation, and accrued expenses | 37,945 | 25,670 | 20,798
Deferred revenue | 43,661 | 1,937 | 28,951
Deferred commissions | (55,175) | (49,746) | (44,036)
Other long-term assets and liabilities | (14,136) | (23,588) | (4,712)
Cash (used in) provided by operating activities | (563) | (42,165) | 104,356
Investing activities |  |  |
Purchases of investments | (326,549) | (11,424) | (69,494)
Proceeds from maturities and called investments | 28,811 | 13,634 | 33,991
Sales of investments | 1,424 | 89,406 | 0
Payments for acquisitions, net of cash acquired | 0 | (10,934) | (800)
Investment in property and equipment | (25,369) | (10,608) | (11,893)
Cash (used in) provided by investing activities | (321,683) | 70,074 | (48,196)
Financing activities |  |  |
Proceeds from issuance of convertible senior notes | 600,000 | 0 | 0
Purchase of capped calls related to convertible senior notes | (51,900) | 0 | 0
Payment of debt issuance costs | (14,527) | 0 | 0
Dividend payments to stockholders | (9,628) | (9,486) | (9,432)
Proceeds from revolving credit facility | 0 | 45,000 | 0
Payments on revolving credit facility | 0 | (45,000) | 0
Common stock repurchases for tax withholdings for net settlement of equity awards | (72,523) | (42,637) | (37,594)
Common stock repurchases under stock repurchase program | (27,974) | (22,135) | (54,434)
Cash provided by (used in) financing activities | 423,448 | (74,258) | (101,460)
Effect of exchange rate changes on cash and cash equivalents | 2,334 | 290 | (2,557)
Net increase (decrease) in cash and cash equivalents | 103,536 | (46,059) | (47,857)
Cash and cash equivalents, beginning of period | 68,363 | 114,422 | 162,279
Cash and cash equivalents, end of period | 171,899 | 68,363 | 114,422
Supplemental disclosures |  |  |
Interest paid on convertible notes | 2,338 | 0 | 0
Income taxes paid | 3,377 | 4,745 | 6,630
Non-cash investing and financing activity: |  |  |
Dividends payable | $ 2,427 | $ 2,388 | $ 2,363

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