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Cost Method Investment (Details) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2014 USD ($) shares | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 £ / shares | Dec. 31, 2016 £ / shares
Investment [Line Items] |  |  |  |  |  |
Impairment charges |  | $ 0 | $ 517 |  |  |
Highview Enterprises Limited |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Investment acquired, shares | shares | 411,765 |  |  |  |  |
Ownership interest, percent | 8.00% |  |  |  |  |
Payments to acquire investments | $ 2,800 |  |  |  |  |
Highview Enterprises Limited | Cost method investment |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Impairment charges |  |  |  | $ 1,800 |  |
Share price, estimated fair value (per shares) | £ / shares |  |  |  |  | £ 2.00 | £ 2.00
Share price (in dollars per shares) | £ / shares |  |  |  |  |  | £ 4.25

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