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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Parent Company [Member] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | $ (484) | $ (842) | $ (400) | $ (1,705)
Partnership Interest [Member] |  |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | $ (484) | $ (842) | $ (400) | $ (1,705)

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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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