Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flow from operating activities:
Net earnings	$ 126,207	$ 147,173
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	131,423	114,021
Amortization of deferred policy acquisition costs	6,321	7,942
Amortization of debt issuance costs	932	961
Interest credited to policyholders	7,651	5,059
Change in allowance for losses on trade receivables	(26)	21
Change in allowance for inventory reserves	1,114	1,221
Net gain on sale of real and personal property	(4,741)	(18,640)
Net (gain) loss on sale of investments	(1,985)	(2,406)
Deferred income tax	12,024	22,733
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(8,870)	(14,138)
Inventories	(11,982)	(4,391)
Prepaid expenses	44,788	39,828
Capitalization of deferred policy acquisition costs	(8,228)	(7,252)
Other assets	17,812	(3,392)
Related party assets	7,836	4,084
Accounts payable and accrued expenses	61,704	57,099
Policy benefits and losses, claims and loss expenses payable	4,747	1,373
Other policyholders' funds and liabilities	4,083	242
Deferred income	8,393	8,727
Related party liabilities	(2,532)	781
Net cash provided by operating activities	396,671	361,046
Cash flow from investing activities:
Property, plant and equipment	(480,259)	(437,287)
Short term investments	(16,491)	(277,038)
Fixed maturity investments	(123,090)	(166,648)
Real estate	(505)	(3,495)
Mortgage loans	(24,382)	(62,572)
Proceeds from sale of:
Property, plant and equipment	142,343	147,196
Short term investments	24,639	279,341
Fixed maturity investments	36,559	55,946
Preferred stock		2,000
Real estate	2,664	831
Mortgage loans	6,054	94,015
Net cash used by investing activities	(432,468)	(367,711)
Cash flow from financing activities:
Borrowings from credit facilities	155,367	103,338
Principal repayments on credit facilities	(64,819)	(48,326)
Debt issuance costs	(1,734)	(223)
Capital lease payments	(56,522)	(37,405)
Employee stock ownership plan	3,516	(1,393)
Securitization deposits	49	93
Common stock dividends paid		(19,586)
Investment contract deposits	155,437	74,157
Investment contract withdrawals	(54,205)	(14,051)
Net cash provided by (used in) financing activities	137,089	56,604
Effects of exchange rate on cash	4,424	(4,397)
Increase (decrease) in cash and cash equivalents	105,716	45,542
Cash and cash equivalents at the beginning of period	697,806	600,646
Cash and cash equivalents at the end of the period	$ 803,522	$ 646,188