Information Services Contracts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Service Contracts [Line Items]
Information service contract payments	$ 13,221	$ 13,038	$ 13,426
2013	3,348
2014	3,332
2015	3,223
2016	3,222
2017	3,220
Thereafter	42,988
Total	59,333
Service Contracts [Member]
Service Contracts [Line Items]
2013	11,175
2014	9,400
2015	8,700
2016	8,700
2017	8,600
Thereafter	900
Total	$ 47,475