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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value) (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable securities |  |
Assets |  |
Total assets | $ 6,024 | $ 14,409
Interest Rate Swap |  |
Liabilities: |  |
Total liabilities | 667 |
Level 1 | Marketable securities |  |
Assets |  |
Total assets | 6,024 | 14,409
Level 1 | Interest Rate Swap |  |
Liabilities: |  |
Total liabilities | 0 |
Level 2 | Marketable securities |  |
Assets |  |
Total assets | 0 | 0
Level 2 | Interest Rate Swap |  |
Liabilities: |  |
Total liabilities | 667 |
Level 3 | Marketable securities |  |
Assets |  |
Total assets | 0 | $ 0
Level 3 | Interest Rate Swap |  |
Liabilities: |  |
Total liabilities | $ 0 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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