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Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative asset: |  |  |  |  |
Common stock of foreign public company, original cost |  | $ 500 |  | $ 500 |
Interest Rate Current Swap [Member] |  |  |  |  |
Derivative asset: |  |  |  |  |
Liability for fixed rate leg |  | 26,700 |  | 32,000 |
Receivable for floating rate leg |  | 25,900 |  | 27,500 |
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  | 13,897 |  | 14,234 |
Common stock of unaffiliated foreign public company | [1] | 743 |  | 731 |
Liabilities: |  |  |  |  |
Interest rate swaps |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  |  |  |
Common stock of unaffiliated foreign public company | [1] |  |  |  |
Liabilities: |  |  |  |  |
Interest rate swaps |  | $ 822 | [2] | $ 4,548 | [3]
[1] | Original cost basis $0.5 million.
[2] | Net of $26.7 million receivable floating leg and $25.9 million liability fixed leg.
[3] | Net of $32.0 million receivable floating leg and $27.5 million liability fixed leg.

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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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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