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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income, before federal income tax $ 49,523 $ 45,888 $ 133,588 $ 121,270
Total all segments 83,960 56,039 173,094 148,065
Interest expense (5,558) (5,570) (16,544) (16,971)
General corporate and other expenses (3,076) (5,984) (16,619) (21,540)
Income from continuing operations, before federal income tax 75,326 44,485 139,931 109,554
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 35,808 10,138 39,939 28,981
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 $ (1,371) $ 13 $ (433) $ (2,186)