Business Segment Information (Property Plant And Equipment Net Of Depreciation By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 1,735,384	$ 1,532,217	$ 1,485,875
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	913,422	1,119,075	1,180,586
United Kingdom [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	355,996	336,317	304,062
Luxembourg [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	465,875	76,749
Other [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 91	$ 76	$ 1,227