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Planned Acquisition Of "The Switch" (Details) (USD $)
 3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Net income $ (37,679,000) $ 9,170,000
The Switch Engineering Oy [Member]
    
Exchange rate dollar per Euro 1.44  
Aggregate purchase price for acquisition 273,600,000  
Cash paid for acquisition 20,600,000  
Cash payments on closing of acquisition 171,000,000  
Common stock par value $ 0.01  
Common stock value issued based on average closing price 82,100,000  
Number of trading days preceding the second business day prior to the closing of the acquisition 20  
Interest rate on the unpaid aggregate purchase price 4.00%  
Exceeded percentage of the total number of shares of common stock 19.90%  
Post-acquisition net cash available to the Company $ 100,000,000  
Maximum number of possible extensions 2  
Extension period, month 1  
Escrow terminated period in case of breach, days 10