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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 164,947 | $ 217,049 | $ 369,873
Less: Income from discontinued operations |  |  | 1,545
Less: Gain on disposal of discontinued operations |  |  | 24,371
Income from continuing operations | 164,947 | 217,049 | 343,957
Adjustments to reconcile income from continuing operations to net cash provided by operating activities: |  |  |
Depreciation | 57,317 | 55,049 | 51,040
Amortization | 93,370 | 90,465 | 55,641
Stock-based compensation | 36,612 | 39,920 | 32,337
Provision for excess and obsolete inventory | 16,592 | 26,849 | 11,601
Deferred taxes | (4,284) | 5,556 | (146,949)
Gain from the sale of an equity investment | (34,212) |  |
Tax benefit related to stock options and restricted stock units | (2,596) | (8,358) |
Non cash charge for the sale of inventories revalued at the date of acquisition |  | 6,089 | 12,178
Retirement plans actuarial (gains) losses | (10,340) | 23,320 | 13,564
Contingent consideration adjustment |  | (8,761) |
Other | (407) | (2,250) | (794)
Changes in operating assets and liabilities, net of businesses sold and acquired: |  |  |
Accounts receivable | (3,656) | (24,093) | 66,367
Inventories | 21,170 | 17,652 | (615)
Prepayments and other assets | (49,572) | (2,995) | (21,509)
Accounts payable and other accrued expenses | 15,103 | (32,810) | (48,222)
Deferred revenue and customer advances | (28,877) | (14,627) | (68,359)
Retirement plan contributions | (5,540) | (4,778) | (11,851)
Accrued income taxes | 1,648 | 19,804 | (8,727)
Net cash provided by continuing operations | 267,275 | 403,081 | 279,659
Net cash used for discontinued operations |  |  | (4,804)
Net cash provided by operating activities | 267,275 | 403,081 | 274,855
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (106,731) | (119,080) | (86,097)
Purchases of available-for-sale marketable securities | (1,168,621) | (748,229) | (685,823)
Acquisition of businesses, net of cash acquired | (14,999) |  | (537,489)
Proceeds from maturities of available-for-sale marketable securities | 516,499 | 225,085 | 442,080
Proceeds from sales of available-for-sale marketable securities | 458,120 | 38,284 | 746,810
Proceeds from the sale of an equity investment | 34,212 |  |
(Purchases of ) proceeds from life insurance | (307) | 1,451 | (1,091)
Net cash used for continuing operations | (281,827) | (602,489) | (121,610)
Net cash provided by discontinued operations |  |  | 39,062
Net cash used for investing activities | (281,827) | (602,489) | (82,548)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock option and stock purchase plans | 17,596 | 18,477 | 17,385
Tax benefit related to stock options and restricted stock units | 2,596 | 8,358 |
Payments of long-term debt | (2,534) | (2,533) | (2,518)
Payments of contingent consideration | (388) | (59,710) |
Repurchase of common stock |  |  | (31,175)
Net cash provided by (used for) financing activities | 17,270 | (35,408) | (16,308)
Increase (decrease) in cash and cash equivalents | 2,718 | (234,816) | 175,999
Cash and cash equivalents at beginning of year | 338,920 | 573,736 | 397,737
Cash and cash equivalents at end of year | 341,638 | 338,920 | 573,736
Cash paid during the year for: |  |  |
Interest | 8,590 | 8,602 | 8,645
Income taxes | $ 38,156 | $ 8,084 | $ 36,043

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + 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 -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 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: 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=31042434&loc=d3e3179-108585 + Details
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