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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]            
Effective Tax Rate 21.00% 26.00% 21.00% 21.00% 23.00%  
U.S. tax deductions for employee stock option gains, the tax benefit           $ 7,334
US NOL Carryforwards           9,907
Expiry Date of Operating Loss CarryForward       2022 to 2029    
Expiry Date of other deductible carryforwards       2016 to 2018    
Foreign NOL Carryforwards           5,535
Other Foreign Deductible Carryforwards           2,770
US statutory rate       34.00%    
Foreign Tax Authority [Member]
            
Operating Loss Carryforwards [Line Items]            
Valuation Allowance, Amount           $ 2,088