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Acquisitions (Details) (USD $)
 1 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2011
Jun. 03, 2011
payment
installment
Y
Acquisitions      
Cash deposited into an escrow account until December 2012     $ 15,000,000
Shares deposited into an escrow account until December 2012     1,300,000
Cash or the company's common stock payable to certain CRI employees and contractors as (the Retention Bonus)     50,000,000
Period over which retention bonus is payable (in years)     3
Number of installments for payment of retention bonus     3
Number of shares used to satisfy tax withholding obligations   161,000  
Issuance of common stock, net   86,143,000  
Approximate installment amount of retention bonus     16,700,000
Number of payments that will be made in either cash or shares of the company's common stock, at the company's option     2
Related transaction costs   3,900,000  
Consideration paid by the company      
Cash     168,805,000
Common Stock     88,438,000
Purchase price paid (in shares) 6,380,806    
Issue price of shares (in dollars per shares)     $ 13.86
Total     257,243,000
Business acquisitions      
Total     257,243,000
Purchase price paid (in shares) 6,380,806    
CRI
      
Acquisitions      
Number of shares used to satisfy tax withholding obligations 161,000    
Consideration paid by the company      
Cash     $ 168,800,000
Purchase price paid (in shares) 6,400,000    
Business acquisitions      
Purchase price paid (in shares) 6,400,000