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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net Income (Loss) | $ (35,689) | $ 3,006
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Stock-based compensation | 7,514 | 6,596
Depreciation | 2,942 | 3,392
Amortization of intangible assets | 10,531 | 10,488
Non-cash interest expense and amortization of convertible debt issuance costs | 2,680 | 1,749
Deferred income taxes | (8,834) | (214)
Restructuring Costs | 670 | 0
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (155) | 0
(Gain) loss from disposal of property, plant and equipment | (45) | (13)
Change in operating assets and liabilities, net of impact of acquisitions: |  |
Accounts receivable | (761) | (5,484)
Unbilled Receivables | (47,778) | 0
Prepaid expenses and other assets | (2,236) | 4,665
Inventories | (595) | (208)
Accounts payable | (1,531) | (978)
Accrued salaries and benefits and other liabilities | (1,120) | (4,943)
Increase (Decrease) in Income Taxes Payable | (562) | 241
Deferred revenue | (3,817) | (1,120)
Net cash provided by operating activities | 16,770 | 17,177
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (1,688) | (1,918)
Purchases of marketable securities | 79,207 | 0
Maturities of marketable securities | 14,225 | 27,048
Proceeds from sale of property, plant, and equipment | 10 | 17
Net cash provided by (used in) investing activities | (66,660) | 25,147
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 1,058 | 2,247
Principal payments against lease financing obligation | (241) | (190)
Payments Related to Tax Withholding for Share-based Compensation | (4,893) | (2,593)
Payments for Repurchase of Common Stock | (50,000) | 0
Net cash used in financing activities | (54,076) | (536)
Effect of Exchange Rate on Cash and Cash Equivalents | 483 | 373
Net increase (decrease) in cash and cash equivalents | (103,483) | 42,161
Cash and cash equivalents at beginning of period | 225,844 | 135,294
Cash and cash equivalents at end of period | 122,361 | 177,455
Non-cash investing and financing activities during the period: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | $ 286 | $ 152

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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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