Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net earnings	$ 308,567	$ 353,875
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	86,493	83,512
Net realized capital (gains) losses	(129,311)	(138,360)
Other than temporary impairment losses	59,598	6,152
(Increase) decrease in reinsurance recoverables, net of reinsurance payable	(28,472)	21,450
(Increase) decrease in premium balances receivable	(159,195)	(183,310)
(Increase) decrease in ceded unearned premiums	(14,702)	(42,446)
(Increase) decrease in deferred acquisition costs	(32,215)	(46,026)
Increase (decrease) in unearned premiums	145,139	234,650
Increase (decrease) in loss and loss adjustment expenses	(133,655)	(165,208)
Change in unrealized foreign exchange losses (gains)	106,318	(36,915)
Other, net	120,405	(97,143)
Net adjustments	20,403	(363,644)
Net cash provided by (used in) operating activities	328,970	(9,769)
Cash flows from investing activities
Purchases of debt securities	(4,145,599)	(3,793,880)
Purchases of equity securities	(2,461,698)	(1,049,749)
Sales of debt securities	3,100,866	3,210,911
Maturities and redemptions of debt securities	794,611	635,041
Sales of equity securities	2,155,293	512,536
Net (purchase) sale in short-term investments	109,187	686,893
Purchases of property and equipment	(13,355)	(30,091)
Purchase of subsidiary, net of cash acquired	(47,469)
Other, net	273,495	(93,506)
Net cash (used in) provided by investing activities	(234,669)	78,155
Cash flows from financing activities
Treasury stock acquisitions	(40,546)	(159,907)
Other, net	259	10,126
Net cash (used in) provided by financing activities	(40,287)	(149,781)
Effect of exchange rate changes on cash	(11,372)	2,535
Net increase (decrease) in cash	42,642	(78,860)
Cash at beginning of period	605,259	498,315
Cash at end of period	647,901	419,455
Cash paid during the period for:
Interest paid	51,283	51,824
Income taxes paid (refunds received)	$ 31,036	$ 155,054