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Acquisition (Schedule of Assets Acquired and Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Jul. 12, 2013 Platinum Health Services, LLC [Member]
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Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Fair value of assets acquired, net of liabilities assumed |  |  | $ 2,604
Goodwill | 40,183 | 16,955 | 23,228
Intangible assets |  |  | 21,000
Net assets acquired |  |  | $ 46,832

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