Segment Information (Identifiable Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Total Identifiable Assets	$ 758,179	$ 768,892
U.S. [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Identifiable Assets	708,173	714,110
U.K. [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Identifiable Assets	113,927	108,894
Other International [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Identifiable Assets	28,004	30,066
Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Identifiable Assets	$ (91,925)	$ (84,178)