CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 83,888	$ 29,276	$ 8,515
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,750	36,148	35,146
Amortization of bond premium	985	620	0
Non cash interest expense on convertible debt	3,695	3,436	3,643
Gain on early extinguishment of debt	0	0	(1,881)
Payments of accreted interest on repurchased convertible debt	0	0	(2,957)
Deferred income taxes	16,209	9,773	(1,572)
Stock compensation	4,146	3,844	3,839
(Gain) losses on auction rate securities	(630)	978	5,187
Losses on other securities	80	328	0
Goodwill impairment	7,797	0	3,832
Loss on equipment disposal	382	2,992	514
Changes in operating assets and liabilities, net of assets acquired:
Accounts receivable, net	(18,038)	814	12,170
Other receivables	11,875	(1,724)	(5,973)
Inventories	(21,284)	(611)	2,513
Production tooling, net	3,640	1,952	2,587
Prepaid expenses and other	(19,557)	(18,541)	3,731
Accounts payable and accrued expenses	8,702	1,789	3,946
Income tax payable	2,932	1,193	(213)
Other long term liability	(17,048)	2,280	(7,357)
Employee benefits	2,168	1,588	2,103
Net cash provided by operating activities	108,692	76,135	67,773
Cash flows from investing activities:
Purchases of property, plant and equipment	(31,262)	(44,220)	(14,534)
Changes in restricted cash	0	3,130	(428)
Purchases of marketable securities	(78,622)	(122,927)	(179,194)
Proceeds from sales and maturities of marketable securities	52,466	39,489	73,170
Acquisition of businesses, net of cash acquired	(27,673)	0	(9,654)
Proceeds from sale of equipment	1,781	969	72
Net cash (used in) investing activities	(83,310)	(123,559)	(130,568)
Cash flows from financing activities:
Proceeds from issuance of stock due to exercise of stock options	1,163	362	33
Tax benefit due to exercise of stock options	740	(472)	149
Shares repurchased	(25,775)	(19,766)	(9,753)
Reduction on long term debt	0	0	(20,239)
Net cash (used in) financing activities	(23,872)	(19,876)	(29,810)
Effect of exchange rates on cash and cash equivalents	(4,671)	(1,418)	(523)
(Decrease) in cash and cash equivalents	(3,161)	(68,718)	(93,128)
Cash and cash equivalents, beginning of period	53,436	122,154	215,282
Cash and cash equivalents, end of period	50,275	53,436	122,154
Supplemental disclosures of cash flow information:
Interest paid	2,709	3,251	2,952
Income taxes paid	23,685	820	733
Supplemental schedule of non-cash financing activities:
Fulfillment of 401(k) obligations through the issuance of stock	$ 1,499	$ 1,319	$ 1,507