Geographic And Segment Reporting (Schedule Of Geographical Segment Information) (Details) (USD $) In Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenues	$ 220,400		$ 193,042		$ 611,527		$ 550,315
Long-lived assets	140,509	[1]	99,015	[1]	140,509	[1]	99,015	[1]
United States [Member]
Revenues	130,556		126,506		363,455		346,797
Long-lived assets	115,226	[1]	86,011	[1]	115,226	[1]	86,011	[1]
Ireland [Member]
Revenues	37,890		22,892		105,213		66,439
Long-lived assets	9,859	[1]	6	[1]	9,859	[1]	6	[1]
Other International [Member]
Revenues	51,954	[2]	43,644	[2]	142,859	[2]	137,079	[2]
Long-lived assets	$ 15,424	[1],[2]	$ 12,998	[1],[2]	$ 15,424	[1],[2]	$ 12,998	[1],[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