Acquisitions and Dispositions - Acquisitions: Purchase Price Allocation (Details) - USD ($) $ in Thousands |
Jul. 07, 2016 |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Goodwill | $ 11,180 | $ 10,358 | |
| The Other Art Fair [Member] | |||
| Business Acquisition [Line Items] | |||
| Goodwill | $ 822 | ||
| Other assets and liabilities assumed | (114) | ||
| Total purchase consideration | $ 1,471 | ||
| The Other Art Fair [Member] | Weighted Average | |||
| Business Acquisition [Line Items] | |||
| Intangibles, useful life | 4 years | ||
| The Other Art Fair [Member] | Trademark | |||
| Business Acquisition [Line Items] | |||
| Intangibles | $ 556 | ||
| Intangibles, useful life | 5 years | ||
| The Other Art Fair [Member] | Artist Relationships | |||
| Business Acquisition [Line Items] | |||
| Intangibles | $ 207 | ||
| Intangibles, useful life | 3 years |