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CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Operating activities |  |  |
Net (loss) income | $ (90,433) | $ 10,617 | $ 98,548
Adjustments to reconcile net (loss) income to cash (used in) provided by operating activities |  |  |
Stock-based compensation expense | 80,909 | 63,862 | 53,313
Deferred income taxes | (49,317) | (30,898) | (2,780)
Amortization of deferred contract costs | 29,152 | 17,271 | 12,106
Lease expense | 14,497 | 0 | 0
Amortization of intangible assets and depreciation | 21,396 | 25,295 | 24,713
Amortization of investments | 800 | 1,596 | 1,381
Foreign currency transaction loss (gain) | 2,335 | (2,421) | 6,413
Other non-cash | (521) | (1,678) | (1,383)
Change in operating assets and liabilities: |  |  |
Accounts receivable, unbilled revenue, and contract assets | 1,088 | 25,779 | (30,379)
Income taxes receivable and other current assets | (6,344) | (6,068) | (13,393)
Accounts payable, accrued compensation, and accrued expenses | 25,670 | 20,798 | 14,473
Deferred revenue | 1,937 | 28,951 | 14,636
Deferred contract costs | (49,746) | (44,036) | (18,738)
Other long-term assets and liabilities | (23,588) | (4,712) | (675)
Cash (used in) provided by operating activities | (42,165) | 104,356 | 158,235
Investing activities |  |  |
Purchases of investments | (11,424) | (69,494) | (27,718)
Proceeds from maturities and called investments | 13,634 | 33,991 | 26,997
Sales of investments | 89,406 | 0 | 0
Payments for acquisitions, net of cash acquired | (10,934) | (800) | (297)
Investment in property and equipment | (10,608) | (11,893) | (13,741)
Cash provided by (used in) investing activities | 70,074 | (48,196) | (14,759)
Financing activities |  |  |
Dividend payments to shareholders | (9,486) | (9,432) | (9,277)
Proceeds from revolving credit facility | 45,000 | 0 | 0
Payments on revolving credit facility | (45,000) | 0 | 0
Common stock repurchases for tax withholdings for net settlement of equity awards | (42,637) | (37,594) | (40,617)
Common stock repurchases under stock repurchase program | (22,135) | (54,434) | (4,335)
Cash (used in) financing activities | (74,258) | (101,460) | (54,229)
Effect of exchange rate changes on cash and cash equivalents | 290 | (2,557) |
Effect of exchange rate changes on cash and cash equivalents (before ASU 2016-18) |  |  | 2,438
Net (decrease) increase in cash and cash equivalents | (46,059) | (47,857) | 91,685
Cash and cash equivalents, beginning of period | 114,422 | 162,279 | 70,594
Cash and cash equivalents, end of period | 68,363 | 114,422 | 162,279
Supplemental disclosures |  |  |
Income taxes paid (refunded) | 4,745 | 6,630 | (2,322)
Non-cash investing and financing activity: |  |  |
Dividends payable | $ 2,388 | $ 2,363 | $ 2,344

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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