Foreign Operations, Geographic Area and Product Segment Information (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	$ 16,192	$ 12,892	$ 10,789
Expenditures for long-lived assets	24,994	60,364	10,724
LED And Solar
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	12,020	8,320	5,506
Expenditures for long-lived assets	20,279	56,141	8,086
Data Storage
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	3,008	3,245	3,581
Expenditures for long-lived assets	3,341	2,703	572
Unallocated Corporate Amount
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets
Depreciation and amortization	1,164	1,327	1,702
Expenditures for long-lived assets	$ 1,374	$ 1,520	$ 2,066