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Acquisitions Of Businesses (Details) $ in Thousands						12 Months Ended
	Apr. 15, 2016 USD ($) Company	Apr. 01, 2016 Company	Oct. 19, 2015 Company	Oct. 13, 2015 Company	Jun. 01, 2015 Company	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 979,628	$ 843,170	$ 834,102
Amortization periods						10 years 6 months
Number of businesses acquired | Company	1	1	1	1	1
Ardent [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Purchase price	$ 201,400
Working capital acquired	36,200
Other net assets	3,900
Goodwill	119,800
Identifiable intangible assets	41,500
Acquired goodwill, tax deductible amount	$ 99,700
Amortization periods						13 years 6 months

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The amount of acquisition cost of a business combination allocated to other net assets.

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The amount of acquisition cost of a business combination allocated to working capital.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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