1. Summary of Significant Accounting Policies (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary Of Significant Accounting Policies Details Narrative
Unrecognized stock-based compensation costs	$ 7,800
Unrecognized stock-based compensation costs amortization period	3 years 3 months 18 days
Aggregate intrinsic value outstanding	91,200
Aggregate intrinsic value exercisable	$ 54,600
Shares available for future grants	459
Common stock repurchased, shares	15,213	227,298