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Derivative Financial Instruments (Company's Derivative Instruments of Interest Rate Swaps) (Details) - LIBOR [Member] $ in Thousands | 9 Months Ended
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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.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The date the derivative commences. + References No definition available. + Details
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