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Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities: |  |  |  |  |
Interest rate swaps |  | $ (9,025) |  |  |
Derivative asset: |  |  |  |  |
Common stock of foreign public company, original cost |  | 500 |  |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative liability: |  |  |  |  |
Liability for fixed rate leg |  | 32,000 |  | $ 34,900 |
Receivable for floating rate leg |  | 27,500 |  | 34,600 |
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  | 14,234 |  | 13,601 |
Common stock of foreign public company | [1] | 731 |  | 999 |
Interest rate swaps |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  |  |  |
Common stock of foreign public company | [1] |  |  |  |
Interest rate swaps |  | $ 4,548 | [2] | $ 313 | [3]
[1] | Original cost basis $0.5 million.
[2] | Net of $32.0 million receivable floating leg and $27.5 million liability fixed leg
[3] | Net of $34.9 million receivable floating leg and $34.6 million liability fixed leg

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