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Schedule IV - Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Direct Amount                 $ 2,048,530 $ 1,873,007 $ 1,693,021
Assumed From Other Companies                 44,464 65,884 29,011
Ceded to Other Companies                 356,922 354,772 282,719
Net premiums earned 451,312 437,568 426,252 420,940 406,853 406,225 392,212 378,829 1,736,072 1,584,119 1,439,313
Percentage of amount assumed to net                 3.00% 4.00% 2.00%
Accident and Health Insurance Segment [Member]
                      
Direct Amount                 55 58 62
Assumed From Other Companies                 0 0 0
Ceded to Other Companies                 55 58 62
Net premiums earned                 0 0 0
Percentage of amount assumed to net                 0.00% 0.00% 0.00%
Property and liability insurance [Member]
                      
Direct Amount                 2,048,475 1,872,949 1,692,959
Assumed From Other Companies                 44,464 65,884 29,011
Ceded to Other Companies                 356,867 354,714 282,657
Net premiums earned                 $ 1,736,072 $ 1,584,119 $ 1,439,313
Percentage of amount assumed to net                 3.00% 4.00% 2.00%