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Other Intangible Assets, Other than Goodwill (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Amortization $ 953us-gaap_AdjustmentForAmortization $ 2,909us-gaap_AdjustmentForAmortization $ 2,508us-gaap_AdjustmentForAmortization
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 783us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 783us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 783us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 783us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 395us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive