Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities:
Net earnings	$ 303,180	$ 226,835
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	214,268	192,357
Amortization of deferred policy acquisition costs	14,197	9,290
Change in allowance for losses on trade receivables	12	(73)
Change in allowance for inventory reserves	3,640	2,050
Net gain on sale of real and personal property	(22,837)	(14,879)
Net gain on sale of investments	(6,088)	(1,050)
Deferred income taxes	48,033	17,757
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	33,355	71,709
Inventories	(12,502)	696
Prepaid expenses	13,109	(13,283)
Capitalization of deferred policy acquisition costs	(25,128)	(43,085)
Other assets	7,929	22,712
Related party assets	5,630	139,590
Accounts payable and accrued expenses	(2,772)	(872)
Policy benefits and losses, claims and loss expenses payable	(18,337)	(30,226)
Other policyholders' funds and liabilities	(23)	(925)
Deferred income	(672)	(3,704)
Related party liabilities	6,257	1,388
Net cash provided by operating activities	561,251	576,287
Purchases of:
Property, plant and equipment	(690,293)	(422,840)
Short term investments	(203,763)	(289,773)
Fixed maturities investments	(237,502)	(308,290)
Equity securities	(388)	(3,130)
Preferred stock	(635)	(2,761)
Real estate	(431)	(1,053)
Mortgage loans	(48,632)	(50,583)
Proceeds from sale and paydowns of:
Property, plant and equipment	214,078	166,904
Short term investments	211,841	280,890
Fixed maturities investments	124,145	85,132
Equity securities	26,957	0
Preferred stock	6,004	5,728
Real estate	0	671
Mortgage loans	45,234	49,215
Net cash used by investing activities	(553,385)	(489,890)
Cash flow from financing activities:
Borrowings from credit facilities	323,039	251,319
Principal repayments on credit facilities	(238,553)	(234,698)
Debt issuance costs	(3,353)	(2,352)
Capital lease payments	(37,480)	(18,310)
Leveraged Employee Stock Ownership Plan - repayments from loan	390	559
Securitization deposits	0	(1,729)
Common stock dividends paid	0	(97,421)
Proceeds from (repayment of) intercompany loans	0	0
Investment contract deposits	109,928	268,478
Investment contract withdrawals	(24,448)	(22,937)
Net cash provided by financing activities	129,523	142,909
Effects of exchange rate on cash	482	(362)
Increase in cash and cash equivalents	137,871	228,944
Cash and cash equivalents at the beginning of period	463,744	357,180
Cash and cash equivalents at the end of the period	$ 601,615	$ 586,124