CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 19,855	$ 48,386
Other comprehensive income, net of tax:
Unrealized investment gains arising during the period	67,703	138,634
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	24,968	59,281
Unrealized investment gains arising during the period, net of reclassification adjustment	92,671	197,915
Foreign currency translation adjustment	29,869	8,196
Total other comprehensive income, net of tax	122,540	206,111
Comprehensive income	$ 142,395	$ 254,497