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Commitments and Contingencies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies [Line Items]      
Rent expense under operating lease agreements $ 21,500,000 $ 20,300,000 $ 17,900,000
Percentage of royalty on net product sales range, minimum 1.00%    
Percentage of royalty on net product sales range, maximum 25.00%    
Accrued royalties 17,600,000 25,659,000  
Royalty expense related to agreements 52,500,000 43,300,000 45,700,000
Total contingent obligation 134,200,000    
Contingent Cash Payments To Be Made In Next Twelve Months 18,900,000    
Additional contingent cash payments to be made in 2014 23,400,000    
Additional contingent cash payments to be made in 2015 16,300,000    
Additional contingent cash payments to be made in 2016 17,500,000    
Additional contingent cash payments to be made in 2017 7,000,000    
Additional Contingent Cash Payments To Be Made From Current Until Fifth Year 51,100,000    
Fair value of contingent consideration 19,000,000    
Commitment under employment contract agreements 15,300,000    
Amounts held in escrow in connection with acquisitions 7,521,000 7,026,000  
Preacquisition contingencies included in accrued and other liabilities 5,493,000 6,203,000  
Accrued Liabilities [Member]
      
Commitments and Contingencies [Line Items]      
Accrued Contingent Obligation 9,800,000    
Other Liabilities [Member]
      
Commitments and Contingencies [Line Items]      
Accrued Contingent Obligation $ 9,200,000