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Short- and Long-Term Investments and Investments on Deposit for Licensure (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Realized gains and losses on available-for-sale securities        
Gross realized gains $ 646 $ 11 $ 2,522 $ 50
Gross realized losses (51) (7) (52) (9)
Net realized gains $ 595 $ 4 $ 2,470 $ 41