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Reinsurance (Details) (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
Reinsurance arrangements                      
Direct premiums written                 $ 780,128 $ 721,462 $ 666,309
Direct Premiums Earned                 751,899 689,955 616,345
Direct Loss and Loss Adjustment Expenses                 249,064 245,335 229,044
Ceded premiums written                 (517,604) (512,979) (466,694)
Ceded Premiums Earned                 (520,779) (490,970) (445,902)
Ceded Loss and Loss Adjustment Expenses                 (122,877) (121,026) (115,689)
Net premiums written                 262,524 208,483 199,615
Premiums earned, net 67,274 59,512 55,694 48,640 51,823 49,634 49,524 48,004 231,120 198,985 170,443
Net Loss and Loss Adjustment Expenses                 $ 126,187 $ 124,309 $ 113,355