Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES
Net income	$ 32,288	$ 18,423
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	14,558	13,389
Interest accretion of convertible notes	4,465	0
Employee stock and stock option related compensation expense	4,181	2,801
Financing costs amortization	877	649
Foreign currency (losses) gains	1,418	(143)
Gain (loss) on disposal of assets	0	1,216
Impairment of intangible assets	3,070	0
Reversal of contingent consideration liability	(4,620)	0
Other non-cash operating activities	737	(13)
Increase (decrease) in cash resulting from changes in operating assets and liabilities:
Accounts receivable	(14,092)	(29,109)
Inventory	(23,674)	(16,099)
Unbilled contract revenues and other current assets	(4,036)	(6,360)
Accounts payable and other current liabilities	(23,036)	(12,731)
Customer advances and billings in excess of contract revenue	2,939	13,198
Net Cash Used In Operating Activities	(4,925)	(14,779)
INVESTING ACTIVITIES
Capital expenditures	(16,802)	(10,433)
Acquisition of businesses, net of cash acquired	0	(1,610)
Other investing activities	0	388
Net Cash Used In Investing Activities	16,802	11,655
FINANCING ACTIVITIES
Proceeds from Issuance of Long-term Debt	21,375	0
Principal payments on long-term debt	(2,563)	(3,250)
Payment of deferred financing costs	(1,458)	(347)
Proceeds from exercise of options	1,843	4,885
Tax benefit from exercise of stock options	6,355	6,984
Common stock repurchases	(4,491)	(1,090)
Net Cash Provided By Financing Activities	21,061	7,182
Effect of exchange rate changes on cash	(1,486)	6,515
Net decrease in cash and cash equivalents	(2,152)	(12,737)
Cash and cash equivalents at beginning of period	256,861	165,112
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 254,709	$ 152,375