Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condendsed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 9,620	$ 28,122	$ 21,081
Other comprehensive income:
Net change in unrealized (gain) loss and foreign currency translation on foreign currency denominated available-for-sale securities	19	(16)	(36)
Net change in unrealized losses on available-for-sale securities			(2)
Foreign currency translation	625	2,293	83
Total other comprehensive income	644	2,277	45
Total comprehensive income	$ 10,264	$ 30,399	$ 21,126