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Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |  |  |  |
Unrealized (gain) loss on derivative, net of tax |  | $ 637 | $ (264) | $ 1,582 | $ (4,358) |  |
Interest rate swap expiration |  |  |  | 2018-10 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |  |  |  |
Interest rate swap notional amount |  | $ 133,100 |  | $ 133,100 |  | $ 136,900 | $ 155,300
Fixed interest rate |  | 2.928% |  | 2.928% |  |  | 1.4935%
Fair value of interest rate swap |  | $ 6,900 |  | $ 6,900 |  | $ 9,000 |
Unrealized gain on interest rate swap |  |  |  | 2,100 |  |  |
Unrealized (gain) loss on derivative, net of tax |  |  |  | $ 1,600 |  |  |
Gain on contract termination | $ 3,500 |  |  |  |  |  |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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