Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flow from operating activities:
Net earnings	$ 250,959	$ 189,989
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	141,518	128,127
Amortization of deferred policy acquisition costs	9,740	5,899
Change in allowance for losses on trade receivables	(6)	(3)
Change in allowance for inventory reserves	716	1,705
Net gain on sale of real and personal property	(20,876)	(13,048)
Net gain on sale of investments	(4,060)	238
Deferred income taxes	63,947	24,926
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	24,561	33,416
Inventories	(5,750)	(1,629)
Prepaid expenses	2,323	422
Capitalization of deferred policy acquisition costs	(16,289)	(24,489)
Other assets	(4,370)	19,770
Related party assets	8,650	142,239
Accounts payable and accrued expenses	24,866	45,412
Policy benefits and losses, claims and loss expenses payable	309	(17,413)
Other policyholders' funds and liabilities	494	4,130
Deferred income	2,191	(671)
Related party liabilities	4,475	415
Net cash provided by operating activities	483,398	539,435
Purchases of:
Property, plant and equipment	(457,671)	(280,986)
Short term investments	(154,703)	(150,987)
Fixed maturities investments	(174,593)	(179,941)
Equity securities	(388)	(26)
Preferred stock	(635)	(1,200)
Real estate	(252)	(792)
Mortgage loans	(14,260)	(50,828)
Proceeds from sale and paydowns of:
Property, plant and equipment	176,453	132,597
Short term investments	162,580	154,577
Fixed maturities investments	93,050	52,586
Equity securities	6,803	0
Preferred stock	6,004	1,453
Real estate	0	590
Mortgage loans	36,415	12,700
Net cash used by investing activities	(321,197)	(310,257)
Cash flow from financing activities:
Borrowings from credit facilities	138,041	88,847
Principal repayments on credit facilities	(122,945)	(171,496)
Debt issuance costs	(233)	(1,010)
Capital lease payments	(21,425)	(9,883)
Leveraged Employee Stock Ownership Plan - repayments from loan	260	316
Securitization deposits	0	(1,729)
Proceeds from (repayment of) intercompany loans	0	0
Investment contract deposits	74,253	169,933
Investment contract withdrawals	(14,721)	(15,275)
Net cash (used) by financing activities	53,230	59,703
Effects of exchange rate on cash	401	(240)
Increase in cash and cash equivalents	215,832	288,641
Cash and cash equivalents at the beginning of period	463,744	357,180
Cash and cash equivalents at the end of the period	$ 679,576	$ 645,821