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Acquisition (Details) (USD $)
1 Months Ended
Jun. 30, 2011
Sep. 30, 2011
Jun. 03, 2011
year
installment
payment
Acquisition   
Cash deposited into an escrow account until December 2012  $ 15,000,000
Shares deposited into an escrow account until December 2012 (in shares)  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 (in installments)  3
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 (in payments)  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
   
Consideration paid by the company   
Purchase price paid (in shares)6,400,000  
Total  257,200,000
Business acquisitions   
Total  $ 257,200,000
Purchase price paid (in shares)6,400,000