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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Cash flows from operating activities: |  |
Net Income (Loss) | $ 1,878 | $ 9,502
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 4,864 | 3,766
Depreciation | 2,969 | 3,227
Amortization of intangible assets | 7,719 | 6,322
Non-cash interest expense and amortization of convertible debt issuance costs | 1,651 | 1,559
Incremental tax benefits from stock-based compensation, Operating Activities | (485) | (182)
Deferred income taxes | 1,142 | 644
Gain from sale of intellectual property and property, plant and equipment, net | (37) | (2,267)
Change in operating assets and liabilities: |  |
Accounts receivable | 10,015 | (540)
Prepaid expenses and other assets | (2,398) | (1,436)
Accounts payable | 266 | (965)
Accrued salaries and benefits and other liabilities | (9,857) | (5,959)
Income taxes payable | (233) | (86)
Deferred revenue | (1,236) | 1,272
Net cash provided by operating activities | 16,258 | 14,857
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (1,599) | (1,095)
Purchases of marketable securities | 0 | (46,779)
Maturities of marketable securities | 54,585 | 40,070
Proceeds from sale of marketable securities | 0 | 6,600
Proceeds from sale of intellectual property and property, plant and equipment | 0 | 2,280
Acquisition of business, net of cash acquired | (80,523) | 0
Net cash provided by (used in) investing activities | (27,537) | 1,076
Cash flows from financing activities: |  |
Incremental tax benefits from stock-based compensation, Financing Activities | 485 | 182
Proceeds received from issuance of common stock under employee stock plans | 3,799 | 1,424
Principal payments against lease financing obligation | (140) | (98)
Net cash provided by financing activities | 4,144 | 1,508
Net increase (decrease) in cash and cash equivalents | (7,135) | 17,441
Cash and cash equivalents at beginning of period | 143,764 | 154,126
Cash and cash equivalents at end of period | 136,629 | 171,567
Non-cash investing activities during the period: |  |
Assumed cash liability from acquisition | 12,100 | 0
Property, plant and equipment received and accrued in accounts payable and other liabilities | $ 830 | $ 248

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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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=56944662&loc=d3e3213-108585 + Details
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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=56944662&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=56944662&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=49167202&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 associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + 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=49167202&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=56944662&loc=d3e3179-108585 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=56944662&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=56944662&loc=d3e3602-108585 + Details
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