Organization and Summary of Significant Accounting Policies (Consolidated Statement of Income) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cost of sales	$ 245,072	$ 178,936	$ 478,274	$ 325,306
Research and development	2,934	3,091	6,004	5,526
Selling and administrative expense	32,656	32,030	64,875	54,263
Income before provision for income taxes	35,296	50,288	68,658	97,054
Provision for income taxes	6,727	9,541	12,826	21,354
Net income	28,569	40,747	55,832	75,700
Earnings per share of common stock-basic	$ 0.20	$ 0.34	$ 0.39	$ 0.63
Earnings per share of common stock-diluted	$ 0.20	$ 0.34	$ 0.38	$ 0.63
Previously Reported [Member]
Cost of sales		180,127		327,688
Research and development		3,191		5,726
Selling and administrative expense		32,308		54,819
Income before provision for income taxes		48,719		93,916
Provision for income taxes		9,397		21,066
Net income	28,600	39,322	55,800	72,850
Earnings per share of common stock-basic		$ 0.33		$ 0.61
Earnings per share of common stock-diluted	$ 0.20	$ 0.32	$ 0.38	$ 0.60
Revised [Member]
Cost of sales		178,936		325,306
Research and development		3,091		5,526
Selling and administrative expense		32,030		54,263
Income before provision for income taxes		50,288		97,054
Provision for income taxes		9,541		21,354
Net income	27,400	40,747	53,400	75,700
Earnings per share of common stock-basic		$ 0.34		$ 0.63
Earnings per share of common stock-diluted	$ 0.19	$ 0.34	$ 0.37	$ 0.63
Impact of Adjustments To Financial Statements [Member]
Cost of sales		(1,191)		(2,382)
Research and development		(100)		(200)
Selling and administrative expense		(278)		(556)
Income before provision for income taxes		1,569		3,138
Provision for income taxes		144		288
Net income		$ 1,425		$ 2,850
Earnings per share of common stock-basic		$ 0.01		$ 0.02
Earnings per share of common stock-diluted		$ 0.02		$ 0.03