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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 13,762	$ 5,655	$ 13,477	$ (818)
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities				964
Reclassification of unrealized gain to a realized gain on available-for-sale securities				(1,557)
Foreign currency translation adjustments	10,421	3,381	(9,452)	1,746
Total other comprehensive income (loss)	10,421	3,381	(9,452)	1,153
Comprehensive income	$ 24,183	$ 9,036	$ 4,025	$ 335

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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