CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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-Solar	$ 71,677	$ 66,997	$ 139,655	$ 121,808
Net sales-Quality Assurance	30,712	29,657	55,671	54,619
Total net sales	102,389	96,654	195,326	176,427
Cost of sales-Solar	46,799	38,306	86,492	69,760
Cost of sales-Quality Assurance	21,679	18,988	41,503	37,216
Total cost of sales	68,478	57,294	127,995	106,976
Gross profit	33,911	39,360	67,331	69,451
Selling, general and administrative expenses	15,316	13,096	29,872	29,065
Provision for bad debt expense	1,144	634	1,467	743
Earnings on equity-method investments	(13)	(54)	(8)	(73)
Operating income	17,464	25,684	36,000	39,716
Interest income	104	36	126	64
Interest expense	(2,808)	(4,411)	(5,605)	(8,642)
Foreign currency transaction (loss) gain	(338)	373	(49)	330
Unrealized gain on interest rate swap		1,446		2,662
Earnings before income tax expense	14,422	23,128	30,472	34,130
Income tax expense	4,712	8,102	9,922	11,344
Net earnings	9,710	15,026	20,550	22,786
Other comprehensive income (loss):
Foreign currency translation gain (loss) (net of tax effect of $706, $1,533, $1,795 and $2,444, respectively)	1,310	(2,845)	3,333	(4,537)
Other comprehensive income (loss)	1,310	(2,845)	3,333	(4,537)
Comprehensive income	$ 11,020	$ 12,181	$ 23,883	$ 18,249
Earnings per share (Note 3):
Basic (in dollars per share)	$ 0.24	$ 0.37	$ 0.50	$ 0.57
Diluted (in dollars per share)	$ 0.23	$ 0.36	$ 0.49	$ 0.55
Weighted-average common shares outstanding:
Basic (in shares)	40,882,026	40,273,457	40,821,482	40,218,559
Diluted (in shares)	42,012,274	42,054,990	42,129,184	41,743,168