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EQUITY METHOD INVESTMENTS (Schedule of Equity Method Investments) (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2018
PTC GP Management LLC [Member] |
Schedule of Equity Method Investments [Line Items] |
Maximum voting percentage required to pass resolution | 50.00%

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- Definition Represents the maximum voting percentage required to pass resolution. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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