Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 4,800,000	$ 4,100,000	$ 3,700,000
Irish Grants Related to Reasearch and Development, Training and Hiring	424,000	261,000	40,000
Deferred Credits and Other Liabilities	3,000,000	2,000,000
Irish Grants Related to Purchased Property Plant and Equipment	174,000	106,000	111,000
Refundable Irish Grants if Operations Cease	$ 3,000,000