Derivative Financial Instruments (Details) (USD $)
Dec. 31, 2014
Derivative Financial Instruments  
Foreign loan balance, gross $ 1,800,000
Foreign currency forward contracts | Not designated as hedging  
Derivative Financial Instruments  
Notional amount 1,781,000
Foreign currency forward contracts | Not designated as hedging | Other assets.  
Derivative Financial Instruments  
Estimated fair value $ 15,000