Business Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Number of physician group practices acquired	3
Business acquisition, total consideration	$ 11.3
Cash consideration	8.5
Contingent consideration	2.8
Goodwill recorded in connection with acquisitions	10.7
Time period for achievement of certain performance measures for payment of contingent consideration, years	4
Assumed payment probability of contingent consideration payment	100.00%
Range of the undiscounted amount under contingent consideration agreement, low	0
Range of the undiscounted amount under contingent consideration agreement, high	3.2
Additional intangible assets	0.5
Fixed assets	0.1
Prior Period Acquisitions [Member]
Contingent consideration		5.0
Goodwill recorded in connection with acquisitions	13.5
Contingent consideration payments related to prior period acquisitions	9.3
Additional intangible assets	1.3
Fixed assets	1.0
Other liabilities	0.8
Goodwill deductible for tax purpose	$ 12.5
Maximum [Member]
Assumed discount rates for acquisition-date fair value	6.00%
Minimum [Member]
Assumed discount rates for acquisition-date fair value	3.00%

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Assumed payment probability of contingent consideration payment.

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Number of physician group practices.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The amount of acquisition cost of a business combination allocated to capital lease obligations assumed from the acquired entity.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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