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Reportable Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 267,821 | $ 224,483 | $ 755,766 | $ 655,453
Interest expense | (21,089) | (16,048) | (60,241) | (47,126)
Stock-based compensation expense | (10,133) | (9,413) | (29,382) | (19,432)
Acquisition-related expenses | (2,547) | (2,537) | (4,567) | (2,537)
Income before income taxes | 251,478 | 212,060 | 708,629 | 617,770
Operating Segment |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | 291,085 | 245,824 | 820,382 | 713,250
Unallocated amount to segment |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Interest expense | 21,089 | 16,048 | 60,241 | 47,126
Interest Income | 5,383 | 4,142 | 14,553 | 10,628
Stock-based compensation expense | 10,133 | 9,413 | 29,382 | 26,584
Acquisition-related expenses | 2,547 | 2,537 | 4,567 | 2,537
Other costs, net | 11,221 | 9,908 | 32,116 | 29,861
Income before income taxes | $ 251,478 | $ 212,060 | $ 708,629 | $ 617,770

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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