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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 | $ 450,003 | $ 461,443 | $ 432,968
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provisions for doubtful accounts on accounts receivable | 3,656 | 2,256 | 3,265
Stock-based compensation expense | 31,708 | 29,183 | 27,579
Deferred income taxes | 169 | (52,219) | (5,824)
Depreciation | 38,165 | 37,422 | 36,531
Amortization of intangibles | 41,530 | 31,409 | 29,856
Change in operating assets and liabilities, net of acquisitions: |  |  |
Increase in accounts receivable | (35,233) | (39,836) | (12,528)
Increase in inventories | (11,389) | (10,930) | (8,707)
Decrease (increase) in other current assets | 5,033 | (7,136) | 4,309
(Increase) decrease in other assets | (11,467) | 1,473 | (12,071)
(Decrease) increase in accounts payable and other current liabilities | (28,127) | 563 | (11,845)
Increase in deferred revenue and customer advances | 8,512 | 11,005 | 2,630
(Decrease) increase in other liabilities | (7,684) | (15,353) | 11,211
Net cash provided by operating activities | 484,876 | 449,280 | 497,374
Cash flows from investing activities: |  |  |
Additions to property, plant, equipment and software capitalization | (118,450) | (104,749) | (85,436)
Business acquisitions, net of cash acquired | (41,395) | (31,016) | (11,100)
Purchase of investments | (2,972,116) | (1,815,988) | (1,749,161)
Maturities and sales of investments | 2,667,232 | 1,655,359 | 1,489,721
Net cash used in investing activities | (464,729) | (296,394) | (355,976)
Cash flows from financing activities: |  |  |
Proceeds from debt issuances | 1,032,209 | 218,324 | 598,528
Payments on debt | (886,644) | (32,107) | (373,751)
Payments of debt issuance costs | (2,039) | (497) | (4,523)
Proceeds from stock plans | 68,958 | 28,869 | 60,153
Purchase of treasury shares | (301,580) | (295,878) | (370,835)
Excess tax benefit related to stock option plans | 15,842 | 10,568 | 32,239
Proceeds from (payments for) derivative contracts | 8,666 | 4,186 | (2,233)
Net cash used in financing activities | (64,588) | (66,535) | (60,422)
Effect of exchange rate changes on cash and cash equivalents | 4,202 | 10,694 | (5,484)
(Decrease) increase in cash and cash equivalents | (40,239) | 97,045 | 75,492
Cash and cash equivalents at beginning of period | 481,035 | 383,990 | 308,498
Cash and cash equivalents at end of period | 440,796 | 481,035 | 383,990
Supplemental cash flow information: |  |  |
Income taxes paid | 55,928 | 59,446 | 50,313
Interest paid | $ 29,563 | $ 28,305 | $ 19,658

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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 -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 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&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 Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 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 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=31042434&loc=d3e3602-108585 + Details
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