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Fair Values of Financial Instruments Reconciliation of Beginning and Ending Balances of Level 3 Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 9,387 $ 1,686 $ 978 $ 2,881 $ 16,285 $ 8,891 $ 2,229 $ 6,571 $ 14,932 $ 33,976 $ 23,867
Fair Value, Measurements, Recurring [Member]
                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value       2,098       2,702 2,098 2,702  
Principal Returned on Level 3 Assets                 (300) (393)  
Amortization/Accretion of Premium/Discount on Level 3 Assets                 67 66  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)                 250 443  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings                 (303) (720)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,812       $ 2,098       $ 1,812 $ 2,098