Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
Net income	$ 36,711	$ 32,288
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	19,963	14,558
Interest accretion of convertible notes discount	4,830	4,465
Employee share-based compensation expense	5,075	4,181
Financing costs amortization	653	877
Unrealized foreign currency transaction loss	80	2,455
Impairment of intangible assets	0	3,070
Reversal of contingent consideration liability	0	4,620
Other non-cash operating activities	3,555	737
Changes in asset and liabilities, net of acquisitions:
Accounts receivable	(20,757)	(13,920)
Inventory	(15,963)	(23,674)
Unbilled contract revenues and other assets	(29,308)	(4,822)
Accounts payable and other liabilities	(1,179)	(23,459)
Customer advances and billings in excess of contract revenue	6,722	2,939
Net Cash Provided by (Used In) Operating Activities	10,382	(4,925)
INVESTING ACTIVITIES
Capital expenditures	(29,226)	(16,802)
Acquisition of business, net of cash acquired	3,032	0
Net Cash Used In Investing Activities	(32,258)	(16,802)
FINANCING ACTIVITIES
Proceeds from long-term debt	0	21,375
Borrowings on revolving credit facilities	100,231	0
Repayments on revolving credit facilities	(97,011)	0
Principal payments on long-term debt	(1,876)	(2,563)
Payment of deferred financing costs	0	1,458
Proceeds from exercise of stock options	4,462	1,843
Excess tax benefit from share-based compensation	4,472	6,355
Common stock repurchases	(1,903)	(4,491)
Dividend distribution to noncontrolling interest	(1,369)	0
Net Cash Provided By Financing Activities	7,006	21,061
Effect of exchange rate changes on cash	(846)	(1,486)
Net decrease in cash and cash equivalents	(15,716)	(2,152)
Cash and cash equivalents at beginning of period	141,498	256,861
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 125,782	$ 254,709