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Acquisitions Acquisitions - Supplemental Pro Forma Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Revenue	$ 844,896,000	$ 707,126,000
Income Before Income Taxes	$ 347,983,000	$ 275,635,000

X

- Definition

Business Acquisition, Pro Forma Income Before Income Taxes

+ References

No definition available.

+ Details

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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- References

No definition available.

+ Details

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