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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net Income (Loss) | $ 3,006 | $ 1,878
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 6,596 | 4,864
Depreciation | 3,392 | 2,969
Amortization of intangible assets | 10,488 | 7,719
Non-cash interest expense and amortization of convertible debt issuance costs | 1,749 | 1,651
Excess tax benefits from stock-based compensation, Operating Activities | 0 | (485)
Deferred income taxes | (214) | 1,142
Gain from sale of intellectual property and property, plant and equipment, net | (13) | (37)
Change in operating assets and liabilities, net of impact of acquisitions: |  |
Accounts receivable | (5,484) | 10,015
Prepaid expenses and other assets | 4,665 | (1,560)
Inventories | (208) | (838)
Accounts payable | (978) | 266
Accrued salaries and benefits and other liabilities | (4,702) | (8,566)
Deferred revenue | (1,120) | (1,236)
Net cash provided by operating activities | 17,177 | 17,782
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (1,918) | (1,599)
Maturities of marketable securities | 27,048 | 54,585
Proceeds from sale of property, plant and equipment | 17 | 0
Acquisitions of businesses, net of cash acquired | 0 | (80,523)
Net cash provided by (used in) investing activities | 25,147 | (27,537)
Cash flows from financing activities: |  |
Excess tax benefits from stock-based compensation, Financing Activities | 0 | 485
Proceeds received from issuance of common stock under employee stock plans | 2,247 | 3,799
Principal payments against lease financing obligation | (190) | (140)
Payments Related to Tax Withholding for Share-based Compensation | (2,593) | (1,482)
Net cash provided by (used in) financing activities | (536) | 2,662
Effect of Exchange Rate on Cash and Cash Equivalents | 373 | (42)
Net increase (decrease) in cash and cash equivalents | 42,161 | (7,135)
Cash and cash equivalents at beginning of period | 135,294 | 143,764
Cash and cash equivalents at end of period | 177,455 | 136,629
Non-cash investing and financing activities during the period: |  |
Assumed cash liability from acquisition | 0 | 12,100
Property, plant and equipment received and accrued in accounts payable and other liabilities | $ 152 | $ 830

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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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=66902209&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=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + 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=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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=66902209&loc=d3e3602-108585 + Details
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