Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Business Acquisition [Line Items]

Pro Forma Information

The amounts have been calculated after applying the Company's accounting policies and adjusting the results of WINS, TranTech, MTCSC, S&IS and STI to reflect the additional amortization expense resulting from recognizing intangible assets, the interest expense effect of the financing necessary to complete the acquisitions and the consequential tax effects (in thousands):

	Year Ended December 31,
	2011		2010
Revenues	$	2,933,759	$	2,810,682
Net income	$	135,990	$	131,170

Sensor Technologies Inc. [Member]

Business Acquisition [Line Items]

Schedule of Purchase Price Allocation

The following table represents the purchase price allocation (in thousands):

Cash and cash equivalents	$	5,310
Receivables	69,870
Prepaid expenses and other	1,033
Property and equipment	357
Other intangibles	93,289
Other assets	65
Goodwill	143,772
Accounts payable and accrued expenses	(69,185		)
Accrued salaries and related expenses	(3,087		)
Other long-term liabilities	(62		)
Purchase price	$	241,362