Restructuring Charges Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 1,796	$ 4,090	$ 0
June 2011 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve	3,492	0
Restructuring charges	823	4,090
Cash payments	(1,466)	(1,222)
Write-off of furniture and fixtures	(239)	(624)
Restructuring reserve	2,610	3,492
June 2011 Plan [Member] | Office Consolidations [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve	3,399	0
Restructuring charges	860	3,436
Cash payments	(1,410)	(661)
Write-off of furniture and fixtures	(239)	(624)
Restructuring reserve	2,610	3,399
June 2011 Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve	93	0
Restructuring charges	(37)	654
Cash payments	(56)	(561)
Write-off of furniture and fixtures	0	0
Restructuring reserve	0	93
March 2012 Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 974