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Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     $ (160,573)    
Change in unrealized gains (losses) on debt securities     164,817    
Change in foreign currency translation adjustment     3,146    
Amortization of net actuarial loss     2,746    
Amortization of prior service credit     (3,053)    
Tax effect $ (3,423) $ 5,213 (38,752) $ 22,920  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (31,669)   (31,669)    
Allocated to the Company (31,670)   (31,670)   $ (160,575)
Allocated to noncontrolling interests 1   1    
Unrealized gains (losses) on debt securities          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (42,165)    
Change in unrealized gains (losses) on debt securities     164,817    
Tax effect (3,690) 4,695 (38,645) 22,483  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance 84,007   84,007    
Allocated to the Company 84,006   84,006    
Allocated to noncontrolling interests 1   1    
Foreign Currency Translation Adjustment          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (65,628)    
Change in foreign currency translation adjustment     3,146    
Tax effect 241 560 (187) 560  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (62,669)   (62,669)    
Allocated to the Company (62,669)   (62,669)    
Allocated to noncontrolling interests 0   0    
Pension Benefit Adjustment          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (52,780)    
Amortization of net actuarial loss     2,746    
Amortization of prior service credit     (3,053)    
Tax effect 26 $ (42) 80 $ (123)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (53,007)   (53,007)    
Allocated to the Company (53,007)   (53,007)    
Allocated to noncontrolling interests $ 0   $ 0