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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 83,846	$ 80,359	$ 77,782
Other comprehensive income (loss):
Currency translation adjustment, gross	(1,374)	10,167	(15,797)
Tax (expense) benefit	563	(3,644)	5,383
Comprehensive income	$ 83,035	$ 86,882	$ 67,368

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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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