v3.2.0.727
Other Comprehensive Income (Loss) (Reclassifications From Accumulated Other Comprehensive Income Into Income, By Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]        
Other-than-temporary impairment losses recognized in net income $ 0 $ (1,007) $ (5,092) $ (1,007)
Net realized investment gains, excluding other-than-temporary impairment losses 6,105 8,127 16,768 25,521
Income Before Income Taxes 100,286 54,359 339,807 170,340
Underwriting, acquisition and insurance expenses (379,652) (365,987) (720,337) (721,492)
Income taxes (7,833) (13,218) (53,348) (41,698)
Net Income 92,453 41,141 286,459 128,642
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Holding Gains On Available-For-Sale Securities [Member]        
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]        
Other-than-temporary impairment losses recognized in net income 0 (1,007) (5,092) (1,007)
Net realized investment gains, excluding other-than-temporary impairment losses 7,560 7,348 24,801 15,446
Income Before Income Taxes 7,560 6,341 19,709 14,439
Income taxes (2,576) (1,523) (5,672) (3,677)
Net Income 4,984 4,818 14,037 10,762
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Net Actuarial Pension Loss [Member]        
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]        
Underwriting, acquisition and insurance expenses (586) (406) (1,165) (805)
Income taxes 117 81 233 161
Net Income $ (469) $ (325) $ (932) $ (644)