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Reportable Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 224,483 | $ 215,670 | $ 655,453 | $ 607,125
Interest expense | (16,048) | (15,166) | (47,126) | (44,014)
Stock-based compensation expense | (9,413) | (8,066) | (26,584) | (23,167)
Acquisition-related expenses | (2,537) |  | (2,537) |
Income before income taxes | 212,060 | 203,140 | 617,770 | 570,568
Segment operating income |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | 245,824 | 233,214 | 713,250 | 657,793
Unallocated amount to segment |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Interest expense | (16,048) | (15,166) | (47,126) | (44,014)
Interest Income | 4,142 | 2,954 | 10,628 | 8,484
Stock-based compensation expense | (9,413) | (8,066) | (26,584) | (23,167)
Acquisition-related expenses | (2,537) |  | (2,537) |
Other costs, net | (9,908) | (9,796) | (29,861) | (28,528)
Income before income taxes | $ 212,060 | $ 203,140 | $ 617,770 | $ 570,568

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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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