Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flow from operating activities:
Net earnings	$ 779,740	$ 388,876
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	410,800	354,183
Amortization of deferred policy acquisition costs	18,217	19,131
Amortization of debt issuance costs	2,910	3,125
Interest credited to policyholders	23,250	18,190
Change in allowance for losses on trade receivables	(25)	(28)
Change in allowance for inventory reserves	4,334	1,897
Net gain on sale of personal property	(14,260)	(30,398)
Net gains on disposal of real estate	(192,223)	(2,377)
Net (gain) loss on sale of investments	(4,250)	(3,948)
Deferred income tax	(179,047)	112,448
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(27,659)	(23,919)
Inventories	(17,410)	(1,901)
Prepaid expenses	(22,220)	79,578
Capitalization of deferred policy acquisition costs	(21,501)	(21,040)
Other assets	6,279	(663)
Related party assets	47,804	(5,469)
Accounts payable and accrued expenses	26,764	30,773
Policy benefits and losses, claims and loss expenses payable	2,767	12,843
Other policyholders' funds and liabilities	590	(382)
Deferred income	(1,297)	1,105
Related party liabilities	(4,542)	(711)
Net cash provided by operating activities	839,021	931,313
Cash flow from investing activities:
Escrow Deposits	19,707	(768)
Purchases of:
Property, plant and equipment	(970,472)	(981,316)
Short term investments	(48,743)	(566,371)
Fixed maturities investments	(274,283)	(261,851)
Equity securities	(662)	(489)
Preferred stock	(1,000)
Real estate	(1,783)	(15,863)
Mortgage loans	(80,707)	(159,309)
Proceeds from sale of:
Property, plant and equipment	591,040	412,892
Short term investments	54,319	566,955
Fixed maturities investments	102,404	147,233
Preferred stock	3,188	3,351
Real estate	5,348	1,681
Mortgage loans	23,726	109,260
Net cash used by investing activities	(577,918)	(744,595)
Cash flow from financing activities:
Borrowings from credit facilities	426,262	534,008
Principal repayments on credit facilities	(303,212)	(244,545)
Debt issuance costs	(4,581)	(4,529)
Capital lease payments	(219,623)	(141,750)
Employee stock ownership plan	(6,764)	(7,541)
Securitization deposits	(2,181)	371
Common stock dividends paid	(19,587)	(39,171)
Investment contract deposits	347,695	180,554
Investment contract withdrawals	(163,499)	(64,459)
Net cash provided by (used in) financing activities	54,510	212,938
Effects of exchange rate on cash	9,468	(16,117)
Increase (decrease) in cash and cash equivalents	325,081	383,539
Cash and cash equivalents at the beginning of period	697,806	600,646
Cash and cash equivalents at the end of the period	$ 1,022,887	$ 984,185