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Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative asset: |  |  |  |  |
Common stock of foreign public company, original cost |  | $ 500 |  | $ 500 |
Interest Rate Current Swap [Member] |  |  |  |  |
Derivative asset: |  |  |  |  |
Liability for fixed rate leg |  | 39,800 |  | 34,900 |
Receivable for floating rate leg |  | 30,800 |  | 34,600 |
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  | 18,728 |  | 13,601 |
Foreign currency options |  | 41 |  |  |
Common stock of unaffiliated foreign public company | [1] | 962 |  | 999 |
Liabilities: |  |  |  |  |
Interest rate swaps |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents |  |  |  |  |
Foreign currency options |  |  |  |  |
Common stock of unaffiliated foreign public company | [1] |  |  |  |
Liabilities: |  |  |  |  |
Interest rate swaps |  | $ 8,985 | [2] | $ 313 | [3]
[1] | Original cost basis $0.5 million
[2] | Net of $39.8 million receivable floating leg and $30.8 million liability fixed leg
[3] | Net of $34.9 million receivable floating leg and $34.6 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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- Definition Fair value of liability associated with financial asset or other 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. + References Reference 1: 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=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 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 (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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