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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net Income (Loss) | $ (51,046) | $ 5,611
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Stock-based compensation | 9,402 | 13,205
Depreciation | 5,529 | 6,722
Amortization of intangible assets | 19,269 | 20,938
Non-cash interest expense and amortization of convertible debt issuance costs | 5,396 | 3,523
Deferred income taxes | (10,202) | 514
Restructuring Costs | 670 | 0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments | 291 | 0
Gain (Loss) on Disposition of Assets Held for Sale | (1,266) | 0
(Gain) loss from disposal of property, plant and equipment | 47 | 180
Change in operating assets and liabilities, net of impact of acquisitions: |  |
Accounts receivable | (13,665) | (13,152)
Unbilled Receivables | 67,905 | 0
Prepaid expenses and other assets | (2,615) | 5,116
Inventories | (1,040) | 304
Accounts payable | (798) | (396)
Accrued salaries and benefits and other liabilities | 4,780 | 499
Increase (Decrease) in Income Taxes Payable | (5,204) | (4,621)
Deferred revenue | (6,441) | 4,090
Net cash provided by operating activities | 20,430 | 42,533
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (5,287) | (3,482)
Purchases of marketable securities | (79,207) | 0
Maturities of marketable securities | 131,823 | 32,048
Proceeds from Sale of Available-for-sale Securities, Equity | 1,350 | 0
Proceeds from Sale of Available-for-sale Securities | 0 | 4,450
Proceeds from Sale of Assets Held for Sale | 3,754 | 0
Proceeds from sale of property, plant, and equipment | 10 | 17
Net cash provided by investing activities | 52,443 | 33,033
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 5,850 | 8,345
Principal payments against lease financing obligation | (499) | (395)
Payments Related to Tax Withholding for Share-based Compensation | (5,195) | (2,824)
Payments for Repurchase of Common Stock | (50,031) | (50,036)
Net cash used in financing activities | (49,875) | (44,910)
Effect of Exchange Rate on Cash and Cash Equivalents | (558) | 1,257
Net increase in cash and cash equivalents | 22,440 | 31,913
Cash and cash equivalents at beginning of period | 225,844 | 135,294
Cash and cash equivalents at end of period | 248,284 | 167,207
Non-cash investing and financing activities during the period: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | $ 1,793 | $ 176

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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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 associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: 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 Reference 2: 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 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from the sale of other assets as part of operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + 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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