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Derivative Instruments (Details 2) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional Amount $ 173,200 $ 134,700
Fair Value 4,534 2,501
Bank of America, N.A. [Member]    
Derivative [Line Items]    
Notional Amount 38,500 17,000
Fair Value 1,598 5
Credit Suisse International [Member]    
Derivative [Line Items]    
Notional Amount 64,300 12,000
Fair Value 1,442 167
Societe Generale [Member]    
Derivative [Line Items]    
Notional Amount 23,200 80,800
Fair Value 772 1,347
Barclays Bank PLC [Member]    
Derivative [Line Items]    
Notional Amount 41,400 7,600
Fair Value 720 137
Citigroup Inc [Member]    
Derivative [Line Items]    
Notional Amount 5,800 17,300
Fair Value $ 2 $ 845
Moody's [Member] | Bank of America, N.A. [Member]    
Derivative [Line Items]    
Credit Rating [1] A1  
Moody's [Member] | Credit Suisse International [Member]    
Derivative [Line Items]    
Credit Rating [1] A2  
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] | Citigroup Inc [Member]    
Derivative [Line Items]    
Credit Rating [1] 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] BBB+  
[1] As assigned by Standard & Poor's Corporation ("S&P") and Moody's Investors Service, Inc. ("Moody's").