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Other Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Impairment charge $ (1,134)      
Patents [Member]
      
Schedule of Equity Method Investments [Line Items]      
Accumulated amortization (2,826) (2,583) (200)
Estimated accumulated amortization, 2013 200    
Estimated accumulated amortization, 2014 200    
Estimated accumulated amortization, 2015 200    
Estimated accumulated amortization, 2016 200    
Estimated accumulated amortization, 2017 200    
Software development [Member]
      
Schedule of Equity Method Investments [Line Items]      
Accumulated amortization $ (498) $ (146)  
Crossbow manufacturer [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 29.00%