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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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