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Segment Information (Income From Continuing Operations, Before Federal Income Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Net investment income $ 32,457 $ 30,650 $ 99,330 $ 97,284
Net realized investment gains 13,431 (1,088) 21,940 3,448
Total investment revenues 45,888 29,562 121,270 100,732
Total all segments 56,039 30,423 148,065 73,268
Interest expense (5,570) (4,725) (16,971) (14,148)
General corporate and other expenses (5,984) (5,384) (21,540) (16,307)
Income from continuing operations before federal income tax 44,485 20,314 109,554 42,813
Total standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 8,776 (651) 24,621 (14,666)
Total standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 1,362 7,220 4,360 2,903
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 10,138 6,569 28,981 (11,763)
GAAP combined ratio 97.50% 98.30% 97.60% 101.00%
Statutory combined ratio 96.00% 96.90% 96.60% 100.10%
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 13 $ (5,708) $ (2,186) $ (15,701)
GAAP combined ratio 100.00% 123.10% 102.40% 131.10%
Statutory combined ratio 100.50% 121.60% 101.90% 120.30%