Assets and Liabilities, at Fair Value (Narrative) (Details) $ in Thousands |
Dec. 31, 2017
USD ($)
investment
|
Jun. 30, 2017
USD ($)
|
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Commemorative coins, held at lower of cost or market | $ 129 | $ 40 |
| Number of investments | investment | 2 | |
| Equity and cost method investment | $ 8,146 | $ 7,967 |
| X | ||||||||||
- Definition Equity Method and Cost Method Investment, Total No definition available.
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| X | ||||||||||
- Definition Inventory, Commemorative Coin, Stated At Lower Cost Or Market No definition available.
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| X | ||||||||||
- Definition Number of Investments No definition available.
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| X | ||||||||||
- References No definition available.
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