Investments Narrative (Details)	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended				1 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2011	Dec. 31, 2009 NMD [Member]	Sep. 30, 2012 J Devices [Member] USD ($)	Sep. 30, 2011 J Devices [Member] USD ($)	Sep. 30, 2012 J Devices [Member] USD ($)	Sep. 30, 2011 J Devices [Member] USD ($)	Dec. 31, 2011 J Devices [Member] USD ($)	Dec. 31, 2009 J Devices [Member]	Oct. 31, 2012 J Devices [Member] Subsequent Event [Member] USD ($)	Oct. 31, 2012 J Devices [Member] Subsequent Event [Member] JPY (¥)	Sep. 30, 2012 J Devices [Member] One Year from Balance Sheet Date [Member]	Sep. 30, 2012 J Devices [Member] More than Two and within Three Years from Balance Sheet Date [Member]	Sep. 30, 2012 J Devices [Member] More than Three and within Four Years from Balance Sheet Date [Member]	Dec. 31, 2009 Toshiba [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Percentage Of Ownership Held By Majority Owners						60.00%
Percentage of ownership held by Company or equity interest	30.00%		30.00%		30.00%		30.00%		30.00%			30.00%
Percentage of ownership held by Joint Venturer																		10.00%
Maximum ownership ratio of call options															60.00%	66.00%	80.00%
Minimum ownership threshold, put option																	80.00%
Equity in earnings of unconsolidated affiliate	$ 2,541,000	$ 3,034,000	$ 5,421,000	$ 6,641,000			$ 2,500,000	$ 3,000,000	$ 5,400,000	$ 6,600,000
Interest income recognized							100,000	200,000	300,000	600,000
Lease receivable, net							10,600,000		10,600,000		20,200,000
Purchase of packaging and test equipment													$ 9,800,000	¥ 761,400,000