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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities: |  |
Net Income (Loss) | $ (26,576) | $ (35,689)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Stock-based compensation | 7,189 | 7,514
Depreciation | 4,809 | 2,942
Amortization of intangible assets | 4,988 | 10,531
Non-cash interest expense and amortization of convertible debt issuance costs | 1,678 | 2,680
Deferred income taxes | (214) | (8,834)
Restructuring Costs | 0 | 670
Gain (Loss) on Sale of Equity Investments | 81 | 0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments | 0 | (155)
(Gain) loss from disposal of property, plant and equipment | 98 | (45)
Change in operating assets and liabilities, net of impact of acquisitions: |  |
Accounts receivable | 7,372 | (761)
Unbilled Receivables | 44,181 | 47,778
Prepaid expenses and other assets | (1,153) | (2,236)
Inventories | (1,370) | (595)
Accounts payable | 2,171 | (1,531)
Accrued salaries and benefits and other liabilities | (4,699) | (1,113)
Increase (Decrease) in Income Taxes Payable | (3,939) | (562)
Deferred revenue | (3,571) | (3,817)
Increase (decrease) in operating lease liabilities | (2,284) | 0
Net cash provided by operating activities | 28,761 | 16,777
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (664) | (1,688)
Purchases of marketable securities | (131,601) | (79,207)
Maturities of marketable securities | 130,772 | 14,225
Proceeds from sale of property, plant and equipment | 0 | 10
Net cash used in investing activities | (1,493) | (66,660)
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 4,856 | 1,058
Principal payments against lease financing obligation | 0 | (241)
Payments Related to Tax Withholding for Share-based Compensation | (3,786) | (4,900)
Payments under Installment | (1,240) | 0
Payments for Repurchase of Common Stock | 0 | (50,000)
Net cash used in financing activities | (170) | (54,083)
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 483
Net increase (decrease) in cash and cash equivalents | 27,098 | (103,483)
Cash and cash equivalents at beginning of period | 116,252 | 225,844
Cash and cash equivalents at end of period | 143,350 | 122,361
Non-cash investing and financing activities during the period: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | $ 6,828 | $ 286

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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