Segment Reporting And Foreign Operations Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 179,140	$ 128,055	$ 114,646
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	134,393	97,881	89,428
Ireland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	36,008	22,203	17,148
Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 8,739	$ 7,971	$ 8,070