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Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment income (expense) comprised primarily of interest and dividends                      
Total investment income                 $ 1,337 $ 1,483 $ 1,626
Less investment expenses                 (896) (695) (634)
Net investment (expense) income 278 215 (16) (36) 430 122 (21) 257 441 788 992
Cash and cash equivalents [Member]
                      
Investment income (expense) comprised primarily of interest and dividends                      
Total investment income                 705 568 99
Debt securities [Member]
                      
Investment income (expense) comprised primarily of interest and dividends                      
Total investment income                 66 494 969
Equity securities [Member]
                      
Investment income (expense) comprised primarily of interest and dividends                      
Total investment income                 $ 566 $ 421 $ 558