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Other Intangible Assets, Other than Goodwill (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amortization $ 2,508 $ 2,180 $ 2,198
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2,909    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 953    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 783    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 783    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 783