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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 120,027 $ 56,618 $ 328,447 $ 235,030
Other comprehensive income (loss), net of tax:        
Change in unrealized investment gains and losses 11,544 (14,434) 49,414 92,731
Benefit plan adjustments (147) (241) (442) (722)
Foreign currency translation adjustment 0 (10) 31 (974)
Other comprehensive income (loss), net of tax 11,397 (14,685) 49,003 91,035
Comprehensive income $ 131,424 $ 41,933 $ 377,450 $ 326,065