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Premiums Receivable (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summarizes the activity in the allowance for doubtful accounts      
Balance, beginning of year $ 5,573 $ 5,104 $ 4,917
Provision for bad debts 2,230 1,209 915
Write-offs (1,379) (740) (728)
Balance, end of year $ 6,424 $ 5,573 $ 5,104