Business Segment Information (Revenue By Geographical Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total net revenues	$ 201,696	[1]	$ 217,110	[1]	$ 197,461	[1]	$ 229,842	[1]	$ 200,113	[2]	$ 213,278	[2]	$ 165,861	[2]	$ 122,748	[2]	$ 846,109	$ 702,000	$ 774,469
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues																	281,308	316,869	402,228
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues																	345,074	275,499	198,011
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues																	$ 219,727	$ 109,632	$ 174,230

[1] 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.

[2] Excludes revenues from discontinued operations of $168.9 million, $172.5 million, $159.2 million and $196.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2011.