Reporting Segments Schedule of fixed assets by geographic area (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Property and equipment, net	$ 22,090	$ 25,295	$ 31,019
US
Segment Reporting Information [Line Items]
Property and equipment, net	19,902	23,335	28,437
UK
Segment Reporting Information [Line Items]
Property and equipment, net	1,724	1,404	1,946
Canada
Segment Reporting Information [Line Items]
Property and equipment, net	301	402	402
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 163	$ 154	$ 234