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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Dividends) (Details) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Ordinary dividends paid $ 55,000,000  
Extraordinary dividends paid 141,100,000  
Total dividends paid 196,100,000  
Maximum ordinary dividends 106,200,000  
Combined total adjusted capital in excess of the authorized control level 3.9  
Retained earnings 1,125,154,000 1,116,319,000
Maximum borrowing percentage for SISC and SISE 10.00%  
SICA [Member]
    
Ordinary dividends paid 28,700,000  
Extraordinary dividends paid 141,100,000  
Total dividends paid 169,800,000  
Maximum ordinary dividends 37,000,000  
SWIC [Member]
    
Ordinary dividends paid 20,500,000  
Extraordinary dividends paid 0  
Total dividends paid 20,500,000  
Maximum ordinary dividends 21,100,000  
SICSC [Member]
    
Ordinary dividends paid 800,000  
Extraordinary dividends paid 0  
Total dividends paid 800,000  
Maximum ordinary dividends 9,100,000  
SICSE [Member]
    
Ordinary dividends paid 500,000  
Extraordinary dividends paid 0  
Total dividends paid 500,000  
Maximum ordinary dividends 7,000,000  
SICNY [Member]
    
Ordinary dividends paid 2,900,000  
Extraordinary dividends paid 0  
Total dividends paid 2,900,000  
Maximum ordinary dividends 7,300,000  
SICNE [Member]
    
Ordinary dividends paid 1,000,000  
Extraordinary dividends paid 0  
Total dividends paid 1,000,000  
Maximum ordinary dividends 3,200,000  
Capital contribution from Parent to subsidiaries 19,500,000  
SAICNJ [Member]
    
Ordinary dividends paid 600,000  
Extraordinary dividends paid 0  
Total dividends paid 600,000  
Maximum ordinary dividends 5,800,000  
MUSIC [Member]
    
Ordinary dividends paid 0  
Extraordinary dividends paid 0  
Total dividends paid 0  
Maximum ordinary dividends 5,400,000  
Capital contribution from Parent to subsidiaries 13,300,000  
SCIC [Member]
    
Ordinary dividends paid 0  
Extraordinary dividends paid 0  
Total dividends paid 0  
Maximum ordinary dividends 7,200,000  
Capital contribution from Parent to subsidiaries 74,400,000  
SFCIC [Member]
    
Ordinary dividends paid 0  
Extraordinary dividends paid 0  
Total dividends paid 0  
Maximum ordinary dividends 3,100,000  
Capital contribution from Parent to subsidiaries 31,900,000  
Parent Company [Member]
    
Debt service, shareholder dividends and general operating purposes 57,000,000  
Additional borrowing capacity for parent 22,000,000  
Investment Portfolio 68,000,000  
Retained earnings $ 1,100,000,000