Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES
Net income	$ 51,173	$ 35,928
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,771	20,410
Interest accretion of convertible notes discount	6,764	1,421
Employee share-based compensation expense	5,711	4,208
Financing costs amortization	1,203	1,094
Foreign Currency Transaction Gain (Loss), Unrealized	(3,095)	1,559
Loss on disposal of assets	0	1,335
Impairment of intangible assets	3,070	0
Reversal of contingent consideration liability	(4,620)	0
Other non-cash operating activities	(609)	(1,826)
(Decrease) increase in cash resulting from changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(28,417)	(23,358)
Inventory	(22,594)	(21,283)
Unbilled contract revenues and other current assets	(3,882)	(10,244)
Accounts payable and other current liabilities	(18,134)	6,312
Customer advances and billings in excess of contract revenue	(1,058)	24,605
Net Cash Provided By Operating Activities	14,473	37,043
INVESTING ACTIVITIES
Payments to Acquire Productive Assets	(28,951)	(15,161)
Proceeds from Sales of Assets, Investing Activities	2,040	0
Acquisition of businesses, net of cash acquired	(182,450)	(37,680)
Other investing activities	(359)	388
Net Cash Used In Investing Activities	(209,720)	(52,453)
FINANCING ACTIVITIES
Proceeds from long-term debt	21,375	0
Borrowings on revolving credit facilities	18,387	0
Principal payments on long-term debt	(3,500)	(4,875)
Proceeds from issuance of convertible notes	0	250,000
Proceeds from issuance of warrants	0	48,848
Payment for call options related to convertible notes	0	(66,486)
Payment of deferred financing costs	(1,445)	(7,340)
Proceeds from exercise of options	3,324	5,101
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	7,934	6,984
Payment of contingent consideration	1,300	1,300
Common stock repurchases	(4,537)	(1,090)
Net Cash Provided By Financing Activities	40,238	229,842
Effect of exchange rate changes on cash	3,923	2,501
Net (decrease) increase in cash and cash equivalents	(151,086)	216,933
Cash and cash equivalents at beginning of period	256,861	165,112
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 105,775	$ 382,045