Income Taxes (Schedule of Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Deferred income on sales to distributors	$ 14,246	$ 13,710
Acquisition costs	1,480	2,894
Deferred compensation	24,664	24,523
Stock compensation	16,923	18,506
Other accrued expenses and reserves	31,158	32,501
Tax credits	21,829	13,640
Gross deferred tax assets	110,300	105,774
Valuation Allowance	(18,430)	(10,898)
Deferred tax assets, net of valuation allowance	91,870	94,876
Depreciation and amortization	(15,739)	(9,832)
Net deferred tax assets	$ 76,131	$ 85,044