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Description of Business and Summary of Significant Accounting Policies (Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Business Combination Segment Allocation [Line Items]    
Document Period End Date Jun. 30, 2014  
Goodwill [Roll Forward]    
Beginning Balance $ 337,068 $ 326,748
Additions, net 14,353 11,136
Foreign currency translation adjustments 1,412 (816)
Ending Balance $ 352,833 $ 337,068
Curepet, Inc. and Healthcare Magic [Member]
   
Business Combination Segment Allocation [Line Items]    
Number of businesses acquired 2