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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Nonmarketable investment securities $ 2,385 $ 2,750
Insurance premiums receivable 855 1,089
Accrued interest receivable 2,711 2,796
Income taxes receivable 5,332 5,160
Deferred income taxes 8,732 9,180
Prepaid expenses 2,259 2,227
Other assets 5,736 5,634
Total $ 28,010 $ 28,836