Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Derivative Financial Instruments - Classifications on Consolidated Balance Sheets (Details) - Designated as Hedging Instrument [Member] - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Notional Amount $ 325,000,000  
Fair Value 3,993,000 $ (616,000)
Interest Rate Swap One [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000 $ 50,000,000
Company Fixed Pay Rate 1.3075% 1.3075%
Fair Value $ (119,000) $ (212,000)
Interest Rate Swap Two [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000 $ 50,000,000
Company Fixed Pay Rate 1.297% 1.297%
Fair Value $ (110,000) $ (198,000)
Interest Rate Swap Three [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000 $ 50,000,000
Company Fixed Pay Rate 1.3025% 1.3025%
Fair Value $ (115,000) $ (206,000)
Interest Rate Swap Four [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.039%  
Fair Value $ 1,227,000 0
Interest Rate Swap Five [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.0395%  
Fair Value $ 1,226,000 0
Interest Rate Swap Six [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.04%  
Fair Value $ 1,222,000 0
Interest Rate Swap Seven [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 25,000,000  
Company Fixed Pay Rate 0.9915%  
Fair Value $ 662,000 $ 0
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap One [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month 1 month
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Two [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month 1 month
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Three [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month 1 month
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Four [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Five [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Six [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Seven [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Term 1 month