CONSOLIDATED INCOME STATEMENTS (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net sales	$ 234,751	$ 205,808	$ 435,190	$ 384,124
Cost of goods sold - materials	68,514	62,753	126,622	116,403
Personnel costs	81,014	70,552	159,903	139,321
Other operating expenses	44,603	40,710	81,993	76,025
Relocation expenses	42	4,185	417	6,244
Depreciation and amortization	7,696	4,460	14,988	8,771
Income from operations	32,882	23,148	51,267	37,360
Interest expense	7,791	7,506	16,170	15,048
Income before taxes	25,091	15,642	35,097	22,312
Provision for income taxes	9,660	5,880	13,453	8,548
Net income	$ 15,431	$ 9,762	$ 21,644	$ 13,764
Basic Per Common Share Data
Net income (in dollars per share)	$ 0.46	$ 0.30	$ 0.65	$ 0.43
Shares used to compute basic per common share amounts (in shares)	33,499,268	32,032,265	33,429,502	31,957,007
Diluted Per Common Share Data
Net income (in dollars per share)	$ 0.45	$ 0.30	$ 0.63	$ 0.42
Shares used to compute diluted per common share amounts (in shares)	34,365,395	32,831,310	34,284,513	32,750,873