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Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Asset [Abstract] |  |  |  |  |
Equity securities, fv-ni, cost |  | $ 500 |  | $ 500 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Cash equivalents |  | 28,705 |  | 16,375 |
Common stock of unaffiliated foreign public company | [1] | 872 |  | 839 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |
Interest rate swaps |  | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Cash equivalents |  | 0 |  | 0 |
Common stock of unaffiliated foreign public company | [1] | 0 |  | 0 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |
Interest rate swaps |  | (14,357) | [2] | (5,518) | [3]
Interest Rate Swap [Member] |  |  |  |  |
Derivative Liability [Abstract] |  |  |  |  |
Derivative Liability, Fair Value, Gross Asset |  | 1,200 |  | 15,200 |
Liability for fixed rate leg |  | $ 15,600 |  | $ 20,700 |
[1] | Original cost basis $0.5 million.
[2] | Net of $1.2 million receivable floating leg and $15.6 million liability fixed leg.
[3] | Net of $15.2 million receivable floating leg and $20.7 million liability fixed leg.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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