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Derivative Instruments (Details 2) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Notional Amount $ 97,600 $ 66,600
Fair Value 1,946 2,458
Bank of America, N.A. [Member]    
Derivative [Line Items]    
Notional Amount 17,000 8,700
Fair Value 269 439
Credit Suisse International [Member]    
Derivative [Line Items]    
Notional Amount 21,300 27,500
Fair Value 646 1,193
Societe Generale [Member]    
Derivative [Line Items]    
Notional Amount 50,100 25,400
Fair Value 911 756
Barclays Bank PLC [Member]    
Derivative [Line Items]    
Notional Amount 5,000 5,000
Fair Value 72 70
Citigroup Inc [Member]    
Derivative [Line Items]    
Notional Amount 4,200 0
Fair Value $ 48 $ 0
Moody's [Member] | Bank of America, N.A. [Member]    
Derivative [Line Items]    
Credit Rating [1] A1  
Moody's [Member] | Societe Generale [Member]    
Derivative [Line Items]    
Credit Rating [1] A2  
Moody's [Member] | Barclays Bank PLC [Member]    
Derivative [Line Items]    
Credit Rating [1] A2  
Moody's [Member] | Credit Suisse International [Member]    
Derivative [Line Items]    
Credit Rating [1] A1  
Moody's [Member] | Citigroup Inc [Member]    
Derivative [Line Items]    
Credit Rating Baa1  
Standard & Poor's [Member] | Bank of America, N.A. [Member]    
Derivative [Line Items]    
Credit Rating [1] A  
Standard & Poor's [Member] | Credit Suisse International [Member]    
Derivative [Line Items]    
Credit Rating [1] A  
Standard & Poor's [Member] | Societe Generale [Member]    
Derivative [Line Items]    
Credit Rating [1] A  
Standard & Poor's [Member] | Barclays Bank PLC [Member]    
Derivative [Line Items]    
Credit Rating [1] A-  
Standard & Poor's [Member] | Citigroup Inc [Member]    
Derivative [Line Items]    
Credit Rating [1] A-  
[1] As assigned by Standard & Poor’s Corporation (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”).