1. Summary of Significant Accounting Policies (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Summary Of Significant Accounting Policies Details Narrative
Unrecognized stock-based compensation costs	$ 14,600
Unrecognized stock-based compensation costs amortization period	3 years 7 months 6 days
Aggregate intrinsic value outstanding	48,300
Aggregate intrinsic value exercisable	$ 34,900
Options exercised	394,000	87,000
Shares available for future grants	3,900,000
Common stock repurchased, shares	118,544	320,154