Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) - Interest Rate Swap
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Sep. 30, 2015
USD ($)
Oct. 31, 2012
USD ($)
swap
Jul. 31, 2011
USD ($)
Mar. 31, 2010
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2007
USD ($)
swap
Derivative [Line Items]                  
Number of instruments | swap                 2
Amount of (gain) loss recognized in income on derivative             $ (266)    
Interest expense reclassified from accumulated other comprehensive (loss) income           $ 566      
Interest Rate Swap Contract 1                  
Derivative [Line Items]                  
Notional amount                 $ 13,081
Interest rate swaps, variable to fixed interest rates                 5.40%
Interest Rate Swap Contract 2                  
Derivative [Line Items]                  
Notional amount                 $ 3,256
Interest rate swaps, variable to fixed interest rates                 5.30%
Interest Rate Swap Contract 3                  
Derivative [Line Items]                  
Notional amount         $ 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]                  
Notional amount       $ 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 | swap     2            
Notional amount     $ 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 | swap     2            
Notional amount     $ 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]                  
Notional amount   $ 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]                  
Notional amount   $ 14,084              
Interest rate swaps, variable to fixed interest rates   3.26%              
Term of interest rate swap contract   15 years              
Interest Rate Swap Contract 9                  
Derivative [Line Items]                  
Notional amount $ 14,100                
Interest rate swaps, variable to fixed interest rates 2.29%                
Term of interest rate swap contract 10 years