Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 61,558	$ 51,173
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,243	22,771
Interest accretion of convertible notes discount	7,317	6,764
Employee share-based compensation expense	6,782	5,711
Financing costs amortization	979	1,203
Unrealized foreign currency transaction (gain) loss	(51)	3,095
Impairment of intangible assets	0	3,070
Reversal of contingent consideration liability	0	(4,620)
Other non-cash operating activities	4,049	(609)
Changes in asset and liabilities, net of acquisitions:
Accounts receivable	(60,051)	(28,417)
Inventory	(12,071)	(22,594)
Unbilled contract revenues and other assets	(16,424)	(3,882)
Accounts payable and other liabilities	(17,952)	(18,134)
Customer advances and billings in excess of contract revenue	15,054	(1,058)
Net Cash Provided by Operating Activities	19,433	14,473
INVESTING ACTIVITIES
Capital expenditures	(50,809)	(28,951)
Proceeds from sale of assets	64	2,040
Other investing activities	0	359
Acquisition of businesses, net of cash acquired	2,965	182,450
Net Cash Used In Investing Activities	(53,710)	(209,720)
FINANCING ACTIVITIES
Proceeds from long-term debt	0	21,375
Borrowings on revolving credit facilities	173,550	18,387
Repayments on revolving credit facilities	(136,782)	0
Principal payments on long-term debt	(2,813)	(3,500)
Payment of deferred financing costs	0	(1,445)
Proceeds from exercise of stock options	5,285	3,324
Excess tax benefit from share-based compensation	5,495	7,934
Payment of Contingent Consideration	0	(1,300)
Common stock repurchases	(1,979)	(4,537)
Dividend distribution to noncontrolling interest	(1,369)	0
Net Cash Provided By Financing Activities	41,387	40,238
Effect of exchange rate changes on cash	3,220	3,923
Net increase (decrease) in cash and cash equivalents	10,330	(151,086)
Cash and cash equivalents at beginning of period	141,498	256,861
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 151,828	$ 105,775