Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Derivative Financial Instruments (Details)

v3.7.0.1
Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) - Interest rate swap instruments
$ in Thousands
 1 Months Ended
Sep. 30, 2015
USD ($)
Oct. 31, 2012
USD ($)
swap
Jul. 31, 2011
USD ($)
Mar. 31, 2010
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2007
USD ($)
contract
Derivative [Line Items]            
Number of instruments held | contract           2
Interest Rate Swap Contract 1            
Derivative [Line Items]            
Initial notional amount of interest rate swaps           $ 13,081
Interest rate swaps, variable to fixed interest rates           5.40%
Interest Rate Swap Contract 2            
Derivative [Line Items]            
Initial notional amount of interest rate swaps           $ 3,256
Interest rate swaps, variable to fixed interest rates           5.30%
Interest Rate Swap Contract 3            
Derivative [Line Items]            
Initial notional amount of interest rate swaps       $ 27,900    
Interest rate swaps, variable to fixed interest rates       3.74%    
Term of interest rate swap contract       14 years    
Interest Rate Swap Contract 4            
Derivative [Line Items]            
Initial notional amount of interest rate swaps     $ 38,571      
Interest rate swaps, variable to fixed interest rates     1.965%      
Term of interest rate swap contract     5 years      
Interest Rate Swap Contract 5            
Derivative [Line Items]            
Number of instruments held | swap   2        
Initial notional amount of interest rate swaps   $ 16,750        
Interest rate swaps, variable to fixed interest rates   1.71%        
Term of interest rate swap contract   8 years        
Future increase in notional amount         $ 42,247  
Interest Rate Swap Contract 6            
Derivative [Line Items]            
Number of instruments held | swap   2        
Initial notional amount of interest rate swaps   $ 25,377        
Interest rate swaps, variable to fixed interest rates   3.70%        
Term of interest rate swap contract   8 years        
Interest Rate Swap Contract 7            
Derivative [Line Items]            
Initial notional amount of interest rate swaps $ 20,746          
Interest rate swaps, variable to fixed interest rates 2.19%          
Term of interest rate swap contract 7 years          
Interest Rate Swap Contract 8            
Derivative [Line Items]            
Initial notional amount of interest rate swaps $ 14,084          
Interest rate swaps, variable to fixed interest rates 3.26%          
Term of interest rate swap contract 15 years