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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,750	$ 4,289	$ 5,526	$ 4,223
Other comprehensive income (loss), net of taxes:
Foreign currency translation	1,067	(106)	(1,933)	(61)
Net change in market value of investments	(51)	25	47	36
Other comprehensive income (loss)	1,016	(81)	(1,886)	(25)
Comprehensive income	$ 6,766	$ 4,208	$ 3,640	$ 4,198

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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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