Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
OPERATING ACTIVITIES
Net income	$ 44,244	$ 20,505	$ 61,156
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs	4,383	3,063	1,616
Call premium related to redemption of long-term debt	4,964	0	0
Employee stock and stock option related compensation expense	5,433	4,933	3,279
Asset impairment	1,218	1,773	1,230
Depreciation and amortization	27,915	23,577	21,412
Interest accretion of convertible notes discount	3,589	0	0
Gain on acquisition of business	0	(1,124)	(6,954)
Foreign currency transaction (gain) loss	(734)	871	(687)
Loss on disposal of assets	323	0	0
Deferred income tax expense (benefit)	(2,491)	(9,345)	(1,751)
Other	(536)	3,236	1,999
Changes in assets and liabilities:
Accounts receivable	(33,095)	(2,614)	15,217
Inventory	(31,628)	(13,717)	25,221
Unbilled contract revenues and other current assets	(10,949)	(2,554)	27,112
Accounts payable and other current liabilities	17,889	10,505	(16,567)
Deferred income taxes	138	(337)	641
Customer advances and billings in excess of contract revenue	50,995	(198)	(45,998)
Net Cash Provided By Operating Activities	81,658	38,574	86,926
INVESTING ACTIVITIES
Capital expenditures	(22,380)	(16,939)	(13,190)
Proceeds from sale of assets	0	989	107
Acquisition of businesses, net of cash acquired	(37,680)	(47,865)	(18,086)
Proceeds from maturities of short term investments	0	0	32,264
Other investing activities	388	(400)	(1,897)
Net Cash (Used In) Investing Activities	(59,672)	(64,215)	(802)
FINANCING ACTIVITIES
Principal payments on long term debt	(6,500)	(18,250)	0
Payment of financing costs	(7,277)	(2,857)	0
Stock option exercise proceeds	7,027	1,063	746
Tax benefit from exercise of stock options	7,879	796	30
Retirement of long-term debt, including call premium	168,139	0	0
Proceeds from issuance of short-term debt	4,758	0	0
Proceeds from issuance of convertible notes	250,000	0	0
Proceeds from issuance of warrants	48,848	0	0
Payment for call options related to convertible notes	(66,486)	0	0
Payment of contingent consideration	(1,300)	0	0
Other financing activities	(1,099)	(54)	0
Net Cash Provided By (Used In) Financing Activities	67,711	(19,302)	776
Net increase (decrease) in cash and cash equivalents	89,697	(44,943)	86,900
Effect of exchange rate changes on cash	2,052	(1,113)	2,103
Cash and cash equivalents at beginning of period	165,112	211,168	122,165
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 256,861	$ 165,112	$ 211,168