Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Price of a single share of a number of saleable stocks of a company.

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Investments - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
Investments - Narrative (Details) $ in Thousands	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