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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 Comprehensive Income [Abstract]
Net income	$ 23,141	$ 18,889	$ 59,068	$ 52,750
Other comprehensive income (loss):
Currency translation adjustment, gross	(1,996)	9,782	(2,632)	12,339
Tax (expense) benefit	102	(3,375)	410	(4,257)
Comprehensive income	$ 21,247	$ 25,296	$ 56,846	$ 60,832

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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