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Acquisition (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Customer Relationships [Member]
Jul. 12, 2013
Platinum Health Services, LLC [Member]
Dec. 31, 2013
Platinum Health Services, LLC [Member]
Jul. 12, 2013
Platinum Health Services, LLC [Member]
Customer Relationships [Member]
Business Acquisition [Line Items]              
Total purchase consideration         $ 46,832    
Cash paid for acquisition 5,000 0 1,000   5,000    
Equity interest issued to acquiree (in shares)         1,215    
Equity interest issued to acquiree (fair value)         30,062    
Contingent consideration (fair value)           11,770  
Acquired finite-lived intangible assets         $ 21,000   $ 21,000
Weighted average useful life of acquired finite-lived intangible assets       8 years     10 years