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Investments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 £ / shares | Jun. 30, 2016 £ / shares
Investment [Line Items] |  |  |  |  |  |  |
Share price (in gbp per share) | £ / shares |  |  |  |  |  | £ 4.25 |
Asset impairment charges |  |  | $ 520 | $ 2,087 | $ 355 |  |
Cost method investment |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Available-for-sale securities, debt securities |  | $ 1,000 | 1,000 | 2,800 |  |  |
Highview Enterprises Limited |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Ownership interest, percent | 8.00% |  |  |  |  |  |
Payments to acquire investments | $ 2,800 |  |  |  |  |  |
Highview Enterprises Limited | Cost method investment |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Share price (in gbp per share) | £ / shares |  |  |  |  |  |  | £ 2
Highview Enterprises Limited | Cost method investment | Other |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  | 1,800 |  |  |  |  |
Certificates of deposit |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Investments |  | $ 0 | $ 0 | $ 300 |  |  |

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