Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) - Interest Rate Swap
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Oct. 31, 2012
USD ($)
swap
Jul. 31, 2011
USD ($)
Mar. 31, 2010
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Feb. 28, 2013
swap
Dec. 31, 2007
USD ($)
swap
Derivative [Line Items]                      
Number of instruments | swap                     2
Interest expense reclassified from accumulated other comprehensive (loss) income         $ 566            
Not Designated as Hedging Instrument                      
Derivative [Line Items]                      
Number of instruments | swap                   1  
Amount of gain (loss) recognized in income on derivative           $ 0 $ 0 $ (266)      
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]                      
Term of interest rate swap contract       14 years              
Notional amount       $ 27,900              
Interest rate swaps, variable to fixed interest rates       6.99%              
Interest Rate Swap Contract 4                      
Derivative [Line Items]                      
Term of interest rate swap contract     5 years                
Notional amount     $ 38,571                
Interest rate swaps, variable to fixed interest rates     1.965%                
Interest Rate Swap Contract 5                      
Derivative [Line Items]                      
Number of instruments | swap   2                  
Term of interest rate swap contract   8 years                  
Notional amount   $ 16,750                  
Interest rate swaps, variable to fixed interest rates   1.71%                  
Future increase in notional amount                 $ 42,247    
Interest Rate Swap Contract 6                      
Derivative [Line Items]                      
Number of instruments | swap   2                  
Term of interest rate swap contract   8 years                  
Notional amount   $ 25,377                  
Interest rate swaps, variable to fixed interest rates   3.70%                  
Interest Rate Swap Contract 7                      
Derivative [Line Items]                      
Term of interest rate swap contract 7 years                    
Notional amount $ 20,746                    
Interest rate swaps, variable to fixed interest rates 2.19%                    
Interest Rate Swap Contract 8                      
Derivative [Line Items]                      
Term of interest rate swap contract 15 years                    
Notional amount $ 14,084                    
Interest rate swaps, variable to fixed interest rates 3.26%