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Segment Information (Reconciliation of Segment Results to Income from Continuing Operations, before Federal Income Tax (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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax $ 11,971 $ 10,151 $ 4,483 $ 12,161 $ (36,543) $ 861 $ (26,962) $ (1,363)      
Total investment revenues                 155,375 140,865 149,683
Total all segments                 194,141 76,858 46,099
Interest expense                 22,538 18,872 18,259
Other General Expense                 27,801 20,351 16,440
Income from continuing operations, before federal income tax                 143,802 37,635 11,400
Total Standard Insurance Operations [Member]
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax                 42,501 (44,449) (96,923)
Excess And Surplus Operations [Member]
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax                 $ (3,735) $ (19,558) $ (6,661)