Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Nonmarketable investment securities	$ 2,808		$ 2,866
Insurance premiums receivable	443		876
Accrued interest receivable	3,460		3,933
Income taxes receivable	3,780		719
Deferred income taxes	8,087		9,036
Interest rate caps (1)	24	[1]	250	[1]
Prepaid expenses	2,945		3,641
Other assets	7,817		5,399
Total	$ 29,364		$ 26,720

[1] See Note 9 for further discussion.