Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flow from operating activities:
Net earnings	$ 179,234	$ 151,721
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	110,049	106,055
Amortization of deferred policy acquisition costs	7,050	4,069
Change in allowance for losses on trade receivables	(16)	(24)
Change in allowance for inventory reserves	2,008	840
Net gain on sale of real and personal property	(17,627)	(17,309)
Net gain on sale of investments	(4,880)	(1,329)
Deferred income taxes	89,129	57,091
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(22,360)	(5,969)
Inventories	177	(3,662)
Prepaid expenses	8,702	4,975
Capitalization of deferred policy acquisition costs	(9,010)	(7,377)
Other assets	21,973	766
Related party assets	5,644	6,710
Accounts payable and accrued expenses	11,327	20,102
Policy benefits and losses, claims and loss expenses payable	35,676	39,452
Other policyholders' funds and liabilities	(3,144)	(1,531)
Deferred income	4,558	2,399
Related party liabilities	293	693
Net cash provided by operating activities	418,783	357,672
Purchase of:
Property, plant and equipment	(348,331)	(274,240)
Short term investments	(138,457)	(109,785)
Real estate	(5,146)	(1,784)
Mortgage loans	(65,612)	(1,308)
Proceeds from sale of:
Property, plant and equipment	110,289	122,157
Short term investments	154,026	178,461
Equity securities	10,210	133
Real estate	109	683
Mortgage loans	29,722	1,421
Net cash used by investing activities	(302,738)	(170,870)
Cash flow from financing activities:
Borrowings from credit facilities	178,267	134,556
Principal repayments on credit facilities	(99,102)	(209,420)
Debt issuance costs	(1,316)	(89)
Capital lease payments	(3,505)	(8,369)
Leveraged Employee Stock Ownership Plan - repayments from loan	556	592
Securitization deposits	38,428
Preferred stock redemption paid	(144,289)
Preferred stock dividends paid	(2,913)	(6,257)
Contribution to related party	(518)
Investment contract deposits	6,070	5,875
Investment contract withdrawals	(14,671)	(17,409)
Net cash used by financing activities	(42,993)	(100,521)
Effects of exchange rate on cash	(389)	(569)
Increase (decrease) in cash and cash equivalents	72,663	85,712
Cash and cash equivalents at the beginning of period	375,496	244,188
Cash and cash equivalents at the end of the period	448,159	329,830
Fixed maturities investments
Purchase of:
Payments to acquire investments	(137,121)	(122,504)
Proceeds from sale of:
Proceeds from sale of acquired investments	97,010	56,841
Equity security investments
Purchase of:
Payments to acquire investments	(9,056)	(9,043)
Preferred stock investments
Purchase of:
Payments to acquire investments	(1,633)	(11,902)
Proceeds from sale of:
Proceeds from sale of acquired investments	$ 1,252	$ 0