CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Comprehensive income (loss)
Net income	$ 202,698	$ 204,374	$ 372,205	$ 304,604
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	24,603	(54,677)	45,989	(55,837)
Net unrealized investment gains (losses)	851,523	(368,719)	1,959,734	(1,002,323)
Defined benefit pension and postretirement plan adjustments	22	(29)	(373)	(500)
Total other comprehensive income (loss), net of tax	876,148	(423,425)	2,005,350	(1,058,660)
Total comprehensive income (loss)	$ 1,078,846	$ (219,051)	$ 2,377,555	$ (754,056)