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Derivative Instruments (Schedule of Interest Rate Swaps) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Nov. 30, 2020 | Jul. 31, 2017
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 390,000 |  |
July 2017 Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  |  | $ 150,000
November 2020 Swap 1 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  | $ 60,000 |
November 2020 Swap 2 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  | 60,000 |
November 2020 Swap 3 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  | 120,000 |
November 2020 Swap 4 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  | $ 120,000 |
Forward-Starting Interest Rate Swaps [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 120,000 |  |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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