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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Income Taxes (Textual) [Abstract]    
Effective tax rate 17.00%  
US NOL carryforwards   $ 11,620
U.S. tax deductions for employee stock option gains, the tax benefit   9,093
Expiry Date of Operating Loss carryforward 2022 to 2032  
Foreign NOL carryforwards   5,279
Other Foreign Deductible carryforwards   3,491
Expiry Date of other deductible carryforwards 2016 to 2019  
Expected tax rate 21.00%  
Foreign Tax Authority [Member]
    
Operating Loss Carryforwards [Line Items]    
Valuation allowance for deferred tax assets   $ 2,284