Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 42,185	$ 27,145	$ 85,610	$ 54,826
Other comprehensive income (loss):
Foreign currency translation adjustments	8,614	(388)	(11,826)	(388)
Available-for-sale securities:
Net unrealized gain on available-for-sale securities, net of income taxes	0	(20)	0	8
Reclassification adjustments for gains included in earnings, net of income taxes	0	17	0	23
Other comprehensive income (loss)	8,614	(391)	(11,826)	(357)
Total comprehensive income	50,799	26,754	73,784	54,469
Segment, Continuing Operations [Member]
Available-for-sale securities:
Total comprehensive income	50,799	30,722	73,784	60,991
Segment, Discontinued Operations [Member]
Available-for-sale securities:
Total comprehensive income	$ 0	$ (3,968)	$ 0	$ (6,522)