Acquisitions Pro Forma Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
As Reported
Business Acquisition [Line Items]
Total revenue from continuing operations	$ 478,161	$ 416,706
Income from continuing operations	59,068	53,421
Net income	59,068	52,750
Income from continuing operations per basic share (in dollars per share)	$ 2.03	$ 1.85
Income from continuing operations per diluted share (in dollars per share)	$ 1.99	$ 1.80
Net income per basic share (in dollars per share)	$ 2.03	$ 1.82
Net income per diluted share (in dollars per share)	$ 1.99	$ 1.77
Pro Forma
Business Acquisition [Line Items]
Total revenue from continuing operations	506,920	456,909
Income from continuing operations	62,506	58,227
Net income	$ 62,506	$ 57,556
Income from continuing operations per basic share (in dollars per share)	$ 2.15	$ 2.01
Income from continuing operations per diluted share (in dollars per share)	$ 2.11	$ 1.96
Net income per basic share (in dollars per share)	$ 2.15	$ 1.99
Net income per diluted share (in dollars per share)	$ 2.11	$ 1.94

Business acquisitions pro forma revenue from continuing operations

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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