Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details)

v3.5.0.2
Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details) - Designated as Hedging Instrument [Member] - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional amount $ 575,000,000  
Derivative, fair value, net (4,445,000) $ (616,000)
Interest Rate Swap One [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.3075%  
Derivative, fair value, net $ (782,000) (212,000)
Interest Rate Swap Two [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.297%  
Derivative, fair value, net $ (771,000) (198,000)
Interest Rate Swap Three [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.3025%  
Derivative, fair value, net $ (777,000) (206,000)
Interest Rate Swap Four [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.039%  
Derivative, fair value, net $ (572,000) 0
Interest Rate Swap Five [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.0395%  
Derivative, fair value, net $ (573,000) 0
Interest Rate Swap Six [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000  
Fixed interest rate 1.04%  
Derivative, fair value, net $ (574,000) 0
Interest Rate Swap Seven [Member]    
Derivative [Line Items]    
Notional amount $ 25,000,000  
Fixed interest rate 0.9915%  
Derivative, fair value, net $ (234,000) 0
Interest Rate Swap Eight [Member]    
Derivative [Line Items]    
Notional amount $ 125,000,000  
Fixed interest rate 1.4025%  
Derivative, fair value, net $ 16,000 0
Interest Rate Swap Nine [Member]    
Derivative [Line Items]    
Notional amount $ 125,000,000  
Fixed interest rate 1.419%  
Derivative, fair value, net $ (178,000) $ 0