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CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | [4] | Dec. 31, 2017 USD ($) | [4] | Dec. 31, 2016 USD ($) | [4]
Operating activities: |  |  |  |  |  |
Net income | $ 10,617 | [1],[2],[3] | $ 98,548 | [1],[2],[3] | $ 45,015 | [1],[2],[3]
Adjustment to reconcile net income to cash provided by operating activities: |  |  |  |  |  |
Deferred income taxes | (30,898) |  | (2,780) |  | (4,398) |
Amortization of intangible assets and depreciation | 25,295 |  | 24,713 |  | 24,137 |
Amortization of deferred contract costs | 17,271 |  | 12,106 |  | 11,574 |
Amortization of investments | 1,596 |  | 1,381 |  | 1,862 |
Stock-based compensation expense | 63,862 |  | 53,313 |  | 40,821 |
Foreign currency transaction (gain) loss | (2,421) | [2] | 6,413 | [2] | (9,360) | [2]
Other non-cash | (1,678) |  | (1,383) |  | (1,382) |
Change in operating assets and liabilities: |  |  |  |  |  |
Accounts receivable, unbilled revenue, and contract assets | 25,779 |  | (30,379) |  | (49,503) |
Income taxes receivable and other current assets | (6,068) |  | (13,393) |  | (10,818) |
Accounts payable, accrued compensation, and accrued expenses | 20,798 |  | 14,473 |  | 1,531 |
Deferred revenue | 28,951 |  | 14,636 |  | 2,639 |
Deferred contract costs | (44,036) |  | (18,738) |  | (12,497) |
Other long-term assets and liabilities | (4,712) |  | (675) |  | 253 |
Cash provided by operating activities | 104,356 |  | 158,235 |  | 39,874 |
Investing activities: |  |  |  |  |  |
Purchases of investments | (69,494) |  | (27,718) |  | (23,969) |
Proceeds from maturities and called investments | 33,991 |  | 26,997 |  | 22,788 |
Sales of investments | 0 |  | 0 |  | 62,210 |
Payments for acquisitions, net of cash acquired | (800) |  | (297) |  | (49,113) |
Investment in property and equipment | (11,893) |  | (13,741) |  | (19,088) |
Cash used in investing activities | (48,196) |  | (14,759) |  | (7,172) |
Financing activities: |  |  |  |  |  |
Dividend payments to shareholders | (9,432) |  | (9,277) |  | (9,174) |
Common stock repurchases for tax withholdings for net settlement of equity awards | (37,594) |  | (40,617) |  | (15,294) |
Common stock repurchases under stock repurchase program | (54,434) |  | (4,335) |  | (27,248) |
Cash used in financing activities | (101,460) |  | (54,229) |  | (51,716) |
Effect of exchange rate on cash and cash equivalents | (2,557) |  | 2,438 |  | (3,418) |
Net (decrease) increase in cash and cash equivalents | (47,857) |  | 91,685 |  | (22,432) |
Cash and cash equivalents, beginning of period | 162,279 | [5] | 70,594 |  | 93,026 |
Cash and cash equivalents, end of period | 114,422 | [5] | 162,279 | [5] | 70,594 |
Supplemental disclosures: |  |  |  |  |  |
Income taxes paid (refunded) | 6,630 |  | (2,322) |  | 28,844 |
Non-cash investing and financing activity: |  |  |  |  |  |
Dividends payable | $ 2,363 |  | $ 2,344 |  | $ 2,298 |
[1] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[2] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[3] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[4] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[5] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

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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=109223946&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=109223946&loc=d3e3213-108585 + 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=109979856&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=109223946&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=109223946&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=109979856&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=109223946&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=109223946&loc=d3e3179-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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