Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash flow from operating activities:
Net earnings	$ 347,261	$ 303,180
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	259,871	214,268
Amortization of deferred policy acquisition costs	13,196	14,197
Change in allowance for losses on trade receivables	(212)	12
Change in allowance for inventory reserves	(744)	3,640
Net gain on sale of real and personal property	(49,944)	(22,837)
Net (gain) loss on sale of investments	(3,254)	(6,088)
Deferred income tax	71,485	48,033
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	1,895	33,355
Inventories	(2,053)	(12,502)
Prepaid expenses	(38,905)	13,109
Capitalization of deferred policy acquisition costs	(20,158)	(25,128)
Other assets	(41,663)	7,929
Related party assets	20,770	5,630
Accounts payable and accrued expenses	(4,009)	(2,772)
Policy benefits and losses, claims and loss expenses payable	(17,587)	(18,337)
Other policyholders' funds and liabilities	2,482	(23)
Deferred income	(16,732)	(672)
Related party liabilities	22	6,257
Net cash provided by operating activities	521,721	561,251
Purchase of:
Property, plant and equipment	(725,447)	(690,293)
Short term investments	(203,018)	(203,763)
Fixed maturities investments	(181,824)	(237,502)
Equity securities	(3,759)	(388)
Preferred stock	(5)	(635)
Real estate	(11,328)	(431)
Mortgage loans	(37,365)	(48,632)
Proceeds from sale of:
Property, plant and equipment	321,680	214,078
Short term investments	220,610	211,841
Fixed maturities investments	75,372	124,145
Equity securities	3,082	26,957
Preferred stock	2,027	6,004
Real estate	396
Mortgage loans	33,192	45,234
Net cash used by investing activities	(506,387)	(553,385)
Cash flow from financing activities:
Borrowings from credit facilities	510,074	323,039
Principal repayments on credit facilities	(266,672)	(238,553)
Debt issuance costs	(9,697)	(3,353)
Capital lease payments	(65,478)	(37,480)
Leveraged Employee Stock Ownership Plan - repayments from loan	267	390
Investment contract deposits	94,979	109,928
Investment contract withdrawals	(38,653)	(24,448)
Net cash provided by financing activities	224,820	129,523
Effects of exchange rate on cash	(6,243)	482
Increase (decrease) in cash and cash equivalents	233,911	137,871
Cash and cash equivalents at the beginning of period	495,112	463,744
Cash and cash equivalents at the end of the period	$ 729,023	$ 601,615