Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other Assets [Line Items]
Nonmarketable investment securities	$ 1,586	$ 2,058
Accrued interest receivable	2,617	2,561
Deferred income taxes	17,456	19,090
Prepaid expenses	1,253	700
Other assets	6,608	6,673
Total	$ 29,520	$ 31,082