Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
REVENUES:
Services	$ 470,756	$ 410,857	$ 343,545
Products	230,876	209,528	147,032
Total revenues	701,632	620,385	490,577
COST OF REVENUES:
Cost of services	382,341	335,118	277,371
Cost of products	160,754	140,956	106,817
Total cost of revenues	543,095	476,074	384,188
Gross profit	158,537	144,311	106,389
OPERATING EXPENSES:
Administrative	41,776	36,133	25,032
Salary and payroll taxes	57,048	53,325	38,218
Total operating expenses	98,824	89,458	63,250
Income from operations	59,713	54,853	43,139
OTHER INCOME (EXPENSE), NET:
Interest expense	(2,716)	(3,388)	(349)
Other income	682	151	216
Total other income (expense), net	(2,034)	(3,237)	(133)
Income before provision for income taxes	57,679	51,616	43,006
PROVISION FOR INCOME TAXES	6,744	7,293	5,014
Net income	$ 50,935	$ 44,323	$ 37,992
INCOME PER SHARE:
Basic (in Dollars per share)	$ 3.39	$ 2.99	$ 2.61
Diluted (in Dollars per share)	$ 3.35	$ 2.94	$ 2.56