Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Level 1
Investment in Global	[1]	$ 6,947	$ 9,979

[1] Global's ordinary shares are publicly traded on the Alternative Investment Market ("AIM"), a market operated by the London Stock Exchange, with quoted prices in active markets. Accordingly, the fair value measurements of these securities have been classified as Level 1.