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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change From Non Taxable Acquisition     $ 3,188
Deferred Tax Liability Accrued And Other Liabilities 49 51  
Deferred Tax Assets Other Current Assets 305 387  
Indefinite Loss Carryforwards 168,574    
Valuation Allowance, Deferred Tax Asset, Change in Amount 16,240 44,230 7,986
Non-deductible stock-based compensation 7,698 7,144 4,941
Additional tax reserve 0 0 4,100
Income Taxes Receivable 195 313  
Accrued Income Taxes 4,725 5,381  
Income Tax Examination, Penalties and Interest Expense, Total     1,093
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 67,308    
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 39,899    
Unrecognized Tax Benefit 4,166 4,717  
Operating Loss Carryforward Expiration Date years 2015 through 2031    
State and Local Jurisdiction [Member]
      
Operating Loss Carryforwards 170,329    
United States [Member]
      
Indefinite Loss Carryforwards 56,265    
Canadian [Member]
      
Indefinite Loss Carryforwards $ 112,309