Reportable Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	$ 206,957	$ 185,279
Interest expense	(15,457)	(13,749)
Stock-based compensation expense	(8,283)	(7,491)
Income before income taxes	194,285	173,717
Total
Reconciliation of segment operating income to consolidated income before income taxes
Segment operating income	224,901	201,535
Unallocated amount to segment
Reconciliation of segment operating income to consolidated income before income taxes
Interest expense	(15,457)	(13,749)
Interest Income	3,095	2,540
Stock-based compensation expense	(8,283)	(7,491)
Other costs, net	(9,971)	(9,118)
Income before income taxes	$ 194,285	$ 173,717

This element represents interest income.

No definition available.

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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

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

This element represents a sum total of expenses not separately reflected on the income statement for the period.

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