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Statutory Accounting and Regulatory Requirements (Tables)
12 Months Ended
Dec. 31, 2012
Statutory Accounting and Regulatory Requirements [Abstract]  
Insurance subsidiaries
                         
    2012     2011     2010  

Capital and surplus

  $ 323,932     $ 314,397     $ 320,388  

Net income

    31,059       26,969       30,484  

Realized investment gains (losses)

    2,958       2,121       3,040