Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flow from operating activities:
Net earnings	$ 436,433	$ 347,261
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	287,562	259,871
Amortization of deferred policy acquisition costs	15,559	13,196
Change in allowance for losses on trade receivables	(182)	(212)
Change in allowance for inventory reserves	(1,939)	(744)
Net gain on sale of real and personal property	(87,789)	(49,944)
Net (gain) loss on sale of investments	(3,779)	(3,254)
Deferred income tax	151,399	71,485
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	8,568	1,895
Inventories	(3,887)	(2,053)
Prepaid expenses	(57,015)	(38,905)
Capitalization of deferred policy acquisition costs	(24,803)	(20,158)
Other assets	20,680	(41,663)
Related party assets	49,803	20,770
Accounts payable and accrued expenses	37,323	(3,806)
Policy benefits and losses, claims and loss expenses payable	12,976	(17,587)
Other policyholders' funds and liabilities	(560)	2,730
Deferred income	1,005	(16,732)
Related party liabilities	(878)	22
Net cash provided by operating activities	840,476	522,172
Cash flow from investing activities:
Property, plant and equipment	(1,051,830)	(725,447)
Short term investments	(391,683)	(203,018)
Fixed maturities investments	(318,664)	(181,824)
Equity securities	(1,315)	(3,759)
Preferred stock	(5)	(5)
Real estate	(23)	(11,328)
Mortgage loans	(99,549)	(37,365)
Proceeds from sale of:
Property, plant and equipment	463,602	321,680
Short term investments	400,844	220,610
Fixed maturities investments	135,727	75,372
Equity securities	$ 808	3,082
Preferred stock		2,027
Real estate		396
Mortgage loans	$ 34,141	33,192
Net cash used by investing activities	(827,947)	(506,387)
Cash flow from financing activities:
Borrowings from credit facilities	508,276	510,074
Principal repayments on credit facilities	(280,304)	(266,672)
Debt issuance costs	(5,957)	(9,697)
Capital lease payments	(110,202)	(65,478)
Employee Stock Ownership Plan	(1,559)	$ (184)
Securitization deposits	448
Common stock dividends paid	(78,374)
Investment contract deposits	246,756	$ 94,979
Investment contract withdrawals	(41,258)	(38,653)
Net cash provided by (used in) financing activities	237,826	224,369
Effects of exchange rate on cash	(17,578)	(6,243)
Increase (decrease) in cash and cash equivalents	232,777	233,911
Cash and cash equivalents at the beginning of period	441,850	495,112
Cash and cash equivalents at the end of the period	$ 674,627	$ 729,023