Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details) - Designated as Hedging Instrument [Member] - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional amount $ 325,000,000 $ 325,000,000
Derivative, fair value, net 4,716,000 3,993,000
Interest Rate Swap One [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.3075% 1.3075%
Derivative, fair value, net $ 5,000 $ (119,000)
Interest Rate Swap Two [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.297% 1.297%
Derivative, fair value, net $ 12,000 $ (110,000)
Interest Rate Swap Three [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.3025% 1.3025%
Derivative, fair value, net $ 9,000 $ (115,000)
Interest Rate Swap Four [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.039% 1.039%
Derivative, fair value, net $ 1,328,000 $ 1,227,000
Interest Rate Swap Five [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.0395% 1.0395%
Derivative, fair value, net $ 1,327,000 $ 1,226,000
Interest Rate Swap Six [Member]    
Derivative [Line Items]    
Notional amount $ 50,000,000 $ 50,000,000
Fixed interest rate 1.04% 1.04%
Derivative, fair value, net $ 1,327,000 $ 1,222,000
Interest Rate Swap Seven [Member]    
Derivative [Line Items]    
Notional amount $ 25,000,000 $ 25,000,000
Fixed interest rate 0.9915% 0.9915%
Derivative, fair value, net $ 708,000 $ 662,000