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Segment Information - Equity in Earnings (Losses) of Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment Reporting Information, Investments	$ (4,142)	$ (1,701)	$ (1,113)
Online Operations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment Reporting Information, Investments	(848)	(1,413)	(1,198)
Other Investments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment Reporting Information, Investments	$ (3,294)	$ (288)	$ 85

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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