Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Assets [Line Items]
Nonmarketable investment securities	$ 1,586	$ 2,058
Accrued interest receivable	2,493	2,561
Insurance premiums receivable	692	887
Income taxes receivable	123	183
Deferred income taxes	18,354	19,090
Prepaid expenses	1,152	700
Other assets	5,647	5,603
Total	$ 30,047	$ 31,082