Inventories (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
VAC [Member]
Inventories [Line Items]
Remaining inventory step-up recognized as inventory on-hand	$ 8,300,000		$ 8,300,000		$ 56,400,000
Charges related to inventory purchase accounting	31,545,000	0	47,273,000	0
Magnetic Technologies [Member]
Inventories [Line Items]
Charges related to inventory purchase accounting	53,891,000	0	69,620,000	0
Magnetic Technologies [Member] | VAC [Member]
Inventories [Line Items]
Charges related to inventory purchase accounting	26,703,000	0	31,404,000	0
Inventory Amount Lower Of Cost Or Market Charge	$ 22,347,000	$ 0	$ 22,347,000	$ 0