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Shareholders' Equity (Intrinsic Value of Restricted Share Units) (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Restricted Share Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate intrinsic value of RSUs outstanding | $ 2,725 | $ 5,469

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |