CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income
Net income	$ 232,190	$ 236,103	$ 377,702	$ 312,575
Other comprehensive income, net of tax:
Foreign currency translation adjustments	43,565	9,942	21,352	87,675
Net unrealized investment gains	306,329	643,893	509,444	1,191,118
Defined benefit pension and postretirement plan adjustments	849	1,156	1,773	(1,703)
Total other comprehensive income, net of tax	350,743	654,991	532,569	1,277,090
Total comprehensive income	$ 582,933	$ 891,094	$ 910,271	$ 1,589,665