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Derivative Financial Instruments (Company's Derivative Instruments of Interest Rate Swaps) (Details) - LIBOR [Member]
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Interest Rate Swap One [Member]  
Derivative [Line Items]  
Date entered 2014-04
Notional amount $ 100,000
Fixed interest rate paid 1.80% [1]
Variable interest rate received 1-month LIBOR
Effective date 2014-07
Expiration date 2019-07
Interest Rate Swap Two [Member]  
Derivative [Line Items]  
Date entered 2014-05
Notional amount $ 50,000
Fixed interest rate paid 2.344% [1]
Variable interest rate received 1-month LIBOR
Effective date 2015-10
Expiration date 2020-10
Interest Rate Swap Three [Member]  
Derivative [Line Items]  
Date entered 2014-05
Notional amount $ 25,000
Fixed interest rate paid 2.326% [1]
Variable interest rate received 1-month LIBOR
Effective date 2015-10
Expiration date 2020-10
Interest Rate Swap Four [Member]  
Derivative [Line Items]  
Date entered 2014-05
Notional amount $ 50,000
Fixed interest rate paid 2.35% [1]
Variable interest rate received 1-month LIBOR
Effective date 2015-10
Expiration date 2020-10
Interest Rate Swap Five [Member]  
Derivative [Line Items]  
Date entered 2014-05
Notional amount $ 50,000
Fixed interest rate paid 2.35% [1]
Variable interest rate received 1-month LIBOR
Effective date 2015-10
Expiration date 2020-10
Interest Rate Swap Six [Member]  
Derivative [Line Items]  
Date entered 2016-04
Notional amount $ 100,000
Fixed interest rate paid 1.00% [1]
Variable interest rate received 1-month LIBOR
Effective date 2017-02
Expiration date 2020-02
Interest Rate Swap Seven [Member]  
Derivative [Line Items]  
Date entered 2016-06
Notional amount $ 75,000
Fixed interest rate paid 0.85% [1]
Variable interest rate received 1-month LIBOR
Effective date 2017-02
Expiration date 2020-02
Interest Rate Swap Eight [Member]  
Derivative [Line Items]  
Date entered 2016-06
Notional amount $ 150,000
Fixed interest rate paid 0.95% [1]
Variable interest rate received 1-month LIBOR
Effective date 2018-01
Expiration date 2021-01
Interest Rate Swap Nine [Member]  
Derivative [Line Items]  
Date entered 2016-06
Notional amount $ 150,000
Fixed interest rate paid 0.95% [1]
Variable interest rate received 1-month LIBOR
Effective date 2018-01
Expiration date 2021-01
Interest Rate Swap Ten [Member]  
Derivative [Line Items]  
Date entered 2016-07
Notional amount $ 50,000
Fixed interest rate paid 0.90% [1]
Variable interest rate received 1-month LIBOR
Effective date 2018-01
Expiration date 2021-01
Interest Rate Swap Eleven [Member]  
Derivative [Line Items]  
Date entered 2016-07
Notional amount $ 50,000
Fixed interest rate paid 0.89% [1]
Variable interest rate received 1-month LIBOR
Effective date 2018-01
Expiration date 2021-01
Interest Rate Swap Twelve [Member]  
Derivative [Line Items]  
Date entered 2017-08
Notional amount $ 100,000
Fixed interest rate paid 1.90% [1]
Variable interest rate received 1-month LIBOR
Effective date 2019-07
Expiration date 2022-07
Interest Rate Swap Thirteen [Member]  
Derivative [Line Items]  
Date entered 2017-08
Notional amount $ 200,000
Fixed interest rate paid 2.20% [1]
Variable interest rate received 1-month LIBOR
Effective date 2020-10
Expiration date 2025-10
Interest Rate Swap Fourteen [Member]  
Derivative [Line Items]  
Date entered 2017-08
Notional amount $ 150,000
Fixed interest rate paid 1.95% [1]
Variable interest rate received 1-month LIBOR
Effective date 2020-02
Expiration date 2023-02
Interest Rate Swap Fifteen [Member]  
Derivative [Line Items]  
Date entered 2018-06
Notional amount $ 200,000
Fixed interest rate paid 2.925% [1]
Variable interest rate received 1-month LIBOR
Effective date 2020-10
Expiration date 2025-10
Interest Rate Swap Sixteen [Member]  
Derivative [Line Items]  
Date entered 2018-06
Notional amount $ 200,000
Fixed interest rate paid 2.925% [1]
Variable interest rate received 1-month LIBOR
Effective date 2020-10
Expiration date 2025-10
[1] Plus applicable margin.