Geographic And Segment Reporting (Schedule Of Geographical Segment Information) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Revenues	$ 202,970		$ 186,102	[1]	$ 391,127	[1]	$ 357,273
Long-lived assets	135,350	[1]	97,546		135,350	[1]	97,546
United States [Member]
Revenues	120,152		117,248	[1]	232,899	[1]	220,291
Long-lived assets	113,636	[1]	84,902		113,636	[1]	84,902
Ireland [Member]
Revenues	36,359		22,520	[1]	67,324	[1]	43,547
Long-lived assets	7,802	[1]	8		7,802	[1]	8
Other International [Member]
Revenues	46,459	[2]	46,334	[1],[2]	90,904	[1],[2]	93,435	[2]
Long-lived assets	$ 13,912	[1],[2]	$ 12,636	[2]	$ 13,912	[1],[2]	$ 12,636	[2]

[1] Includes property and equipment, net and other assets

[2] No single location within Other International accounts for greater than 10% of total revenues