Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES:
Services	$ 145,000	$ 140,803	$ 296,312	$ 282,245
Products	62,653	56,678	123,355	113,769
Total revenues	207,653	197,481	419,667	396,014
COST OF REVENUES:
Cost of services	120,093	113,086	241,207	225,364
Cost of products	42,007	38,682	82,684	79,295
Total cost of revenues	162,100	151,768	323,891	304,659
Gross profit	45,553	45,713	95,776	91,355
OPERATING EXPENSES:
Administrative	12,329	12,912	27,141	23,691
Salary and payroll taxes	18,285	15,790	37,922	32,925
Total operating expenses	30,614	28,702	65,063	56,616
Income from operations	14,939	17,011	30,713	34,739
OTHER INCOME (EXPENSE), NET:
Interest expense	(1,137)	(1,537)	(2,556)	(3,124)
Other income	159	92	303	338
Total other income (expense), net	(978)	(1,445)	(2,253)	(2,786)
Income before provision for income taxes	13,961	15,566	28,460	31,953
PROVISION FOR INCOME TAXES	1,669	1,495	3,428	3,312
Net income	$ 12,292	$ 14,071	$ 25,032	$ 28,641
INCOME PER SHARE:
Basic (in Dollars per share)	$ 0.84	$ 0.93	$ 1.71	$ 1.89
Diluted (in Dollars per share)	$ 0.83	$ 0.92	$ 1.69	$ 1.87