Business Segment Information (Revenue By Geographical Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total net revenues	$ 226,837	[1]	$ 220,117	[1]	$ 232,178	[1]	$ 197,429	[1]	$ 201,696	[2]	$ 217,110	[2]	$ 197,461	[2]	$ 229,842	[2]	$ 876,561	$ 846,109	$ 702,000
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues																	345,525	281,308	316,869
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues																	403,816	345,074	275,499
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues																	$ 127,220	$ 219,727	$ 109,632

[1] Excludes revenues from discontinued operations of $48.8 million for the quarter ended March 31, 2013.

[2] Excludes revenues from discontinued operations of $178.1 million, $149.9 million, $119.1 million and $110.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2012.