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Segment Information - Equity in Earnings (Losses) of Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in loss of unconsolidated investments	$ (887)	$ (471)	$ (1,682)	$ (1,255)
Online Operations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in loss of unconsolidated investments	(393)	(490)	(523)	(1,044)
Other Investments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in loss of unconsolidated investments	$ (494)	$ 19	$ (1,159)	$ (211)

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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