Condensed Consolidated Statements Of Income (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 Statements Of Income [Abstract]
Net revenues	$ 167,627	$ 140,545	$ 469,984	$ 387,233
Cost of revenues	100,893	84,881	295,653	230,764
Gross profit	66,734	55,664	174,331	156,469
Selling, general and administrative expenses	36,679	24,924	89,083	66,286
Income from operations	30,055	30,740	85,248	90,183
Other income, principally interest	1,632	4,876	13,674	9,118
Income before income taxes	31,687	35,616	98,922	99,301
Income tax expense	5,480	5,177	20,026	15,471
Net income	$ 26,207	$ 30,439	$ 78,896	$ 83,830
Dividend per share	$ 0.06	$ 0.06	$ 0.18	$ 0.18
EARNINGS PER SHARE:
Basic	$ 0.63	$ 0.73	$ 1.90	$ 2.02
Diluted	$ 0.63	$ 0.73	$ 1.89	$ 2.02
Weighted average common shares outstanding:
Basic	41,640	41,537	41,608	41,509
Diluted	41,724	41,618	41,710	41,588