Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flow from operating activities:
Net earnings	$ 388,876	$ 436,433
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	354,183	287,562
Amortization of deferred policy acquisition costs	19,131	15,559
Amortization of debt issuance costs	3,125	2,319
Interest credited to policyholders	18,190	13,844
Change in allowance for losses on trade receivables	(28)	(182)
Change in allowance for inventory reserves	1,897	(1,939)
Net gain on sale of real and personal property	(32,775)	(87,789)
Net (gain) loss on sale of investments	(3,948)	(3,779)
Deferred income tax	112,448	151,399
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(23,919)	8,568
Inventories	(1,901)	(3,887)
Prepaid expenses	79,578	(57,015)
Capitalization of deferred policy acquisition costs	(21,040)	(24,803)
Other assets	(1,431)	18,361
Related party assets	(5,469)	49,803
Accounts payable and accrued expenses	30,773	37,323
Policy benefits and losses, claims and loss expenses payable	12,843	12,976
Other policyholders' funds and liabilities	(382)	(560)
Deferred income	1,105	1,005
Related party liabilities	(711)	(878)
Net cash provided by operating activities	930,545	854,320
Cash flow from investing activities:
Property, plant and equipment	(981,316)	(1,051,830)
Short term investments	(566,371)	(391,683)
Fixed maturities investments	(261,851)	(318,664)
Equity securities	(489)	(1,315)
Preferred stock		(5)
Real estate	(15,863)	(23)
Mortgage loans	(159,309)	(99,549)
Proceeds from sale of:
Property, plant and equipment	412,892	463,602
Short term investments	566,955	400,844
Fixed maturities investments	147,233	135,727
Equity securities		808
Preferred stock	3,351
Real estate	1,681
Mortgage loans	109,260	34,141
Net cash used by investing activities	(743,827)	(827,947)
Cash flow from financing activities:
Borrowings from credit facilities	534,008	508,276
Principal repayments on credit facilities	(244,545)	(280,304)
Debt issuance costs	(4,529)	(5,957)
Capital lease payments	(141,750)	(110,202)
Employee Stock Ownership Plan	(7,541)	(1,559)
Securitization deposits	371	448
Common stock dividends paid	(39,171)	(78,374)
Investment contract deposits	180,554	232,912
Investment contract withdrawals	(64,459)	(41,258)
Net cash provided by (used in) financing activities	212,938	223,982
Effects of exchange rate on cash	(16,117)	(17,578)
Increase (decrease) in cash and cash equivalents	383,539	232,777
Cash and cash equivalents at the beginning of period	600,646	441,850
Cash and cash equivalents at the end of the period	$ 984,185	$ 674,627