Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES
Net income	$ 18,423	$ 3,877
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,389	11,630
Employee stock and stock option related compensation expense	2,801	2,261
Financing costs amortization	649	2,366
Gain on acquisition of business		(1,124)
Foreign currency (gains) losses	(143)	1,429
Asset impairment charge		700
Loss on disposal of equipment	1,216
Other non-cash operating activities	(13)	2,366
Increase (decrease) in cash resulting from changes in operating assets and liabilities:
Accounts receivable	(29,109)	(12,431)
Inventory	(16,099)	941
Unbilled contract revenues and other current assets	(6,360)	4,115
Accounts payable and other current liabilities	(12,731)	(2,345)
Customer advances and billings in excess of contract revenue	13,198	895
Net Cash (Used In) Provided By Operating Activities	(14,779)	14,680
INVESTING ACTIVITIES
Capital expenditures	(10,433)	(7,899)
Acquisition of businesses, net of cash acquired	(1,610)	(5,112)
Other investing activities	388
Net Cash Used In Investing Activities	(11,655)	(13,011)
FINANCING ACTIVITIES
Principal payments on long term debt	(3,250)	(15,000)
Stock option exercise proceeds	4,885	37
Payment of deferred financing costs	(347)	(2,515)
Tax benefit from exercise of stock options	6,984
Other financing activities	(1,090)	(56)
Net Cash Provided By (Used In) Financing Activities	7,182	(17,534)
Net decrease in cash and cash equivalents	(19,252)	(15,865)
Effect of exchange rate changes on cash	6,515	(6,613)
Cash and cash equivalents at beginning of period	165,112	211,168
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 152,375	$ 188,690