Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net Income	$ 25,572	$ 27,126
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,227	31,531
Stock-based compensation	4,198	4,975
Amortization of prepaid debt fees	348	1,305
Amortization of convertible debt discount	0	2,643
Deferred taxes, net	(69)	7,569
Other adjustments, net	863	(2,000)
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	20,825	24,545
Inventories	(10,994)	(34,074)
Other current assets	(7,261)	(12,058)
Other long-term assets	1,308	(20,935)
Accounts payables, other current liabilities, and taxes payable	2,953	11,311
Wages and benefits payable	(13,358)	(29,383)
Unearned revenue	9,740	15,693
Warranty	(3,357)	6,445
Other operating, net	(3,992)	1,320
Net cash provided by operating activities	54,003	36,013
Investing activities
Acquisitions of property, plant, and equipment	(12,043)	(11,250)
Business acquisition, net of cash equivalents acquired	(860)	(14,829)
Other investing, net	283	305
Net cash used in investing activities	(12,620)	(25,774)
Financing activities
Payments on debt	(13,750)	(52,919)
Issuance of common stock	978	1,142
Repurchase of common stock	(10,594)	0
Other financing, net	140	(589)
Net cash used in financing activities	(23,226)	(52,366)
Effect of foreign exchange rate changes on cash and cash equivalents	3,195	6,062
Increase (decrease) in cash and cash equivalents	21,352	(36,065)
Cash and cash equivalents at beginning of period	133,086	169,477
Cash and cash equivalents at end of period	154,438	133,412
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	2,517	(2,139)
Fair value of contingent and deferred consideration payable for business acquisition	0	5,108
Cash paid during the period for:
Income taxes, net	10,270	2,680
Interest, net of amounts capitalized	$ 2,088	$ 9,495