CONDENSED CONSOLIDATED INCOME STATEMENTS (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
CONDENSED CONSOLIDATED INCOME STATEMENTS [Abstract]
Revenues	$ 342,170	$ 314,519	$ 1,010,472	$ 948,435
Cost of revenues	267,494	237,844	821,292	737,043
Research and development expenses	26,681	35,367	67,248	95,798
Selling, general and administrative expenses	23,327	21,952	64,340	66,645
Income from operations	24,668	19,356	57,592	48,949
Interest income and other	369	486	12,561	1,232
Interest expense	(2,880)	(2,418)	(8,217)	(7,120)
Income before income taxes	22,157	17,424	61,936	43,061
Income tax provision	(5,684)	(6,795)	(11,912)	(16,819)
Net income	$ 16,473	$ 10,629	$ 50,024	$ 26,242
Basic income per share	$ 0.28	$ 0.18	$ 0.85	$ 0.45
Diluted income per share	$ 0.28	$ 0.18	$ 0.84	$ 0.45