Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flow from operating activities:
Net earnings	$ 80,569	$ 78,223
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	63,641	54,068
Amortization of deferred policy acquisition costs	2,811	4,375
Change in allowance for losses on trade receivables	(102)	135
Change in allowance for inventory reserves	695	1,377
Net gain on sale of real and personal property	(7,516)	(9,710)
Net gain on sale of investments	39	(3,516)
Deferred income taxes	4,641	32,446
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	23,486	(37,146)
Inventories	(5,398)	(393)
Prepaid expenses	267	1,150
Capitalization of deferred policy acquisition costs	(5,420)	(4,518)
Other assets	20,518	10,586
Related party assets	139,519	(3,198)
Accounts payable and accrued expenses	47,981	17,534
Policy benefits and losses, claims and loss expenses payable	(24,242)	4,517
Other policyholders' funds and liabilities	(1,884)	(1,084)
Deferred income	6,457	8,328
Related party liabilities	1,531	245
Net cash provided by operating activities	347,593	153,419
Purchase of:
Property, plant and equipment	(157,786)	(215,779)
Short term investments	(55,075)	(66,363)
Equity securities		(8,759)
Real estate		(12)
Mortgage loans	(14,452)	(36,202)
Proceeds from sale of:
Property, plant and equipment	62,426	55,010
Short term investments	66,393	79,877
Equity securities		8,800
Real estate	4	34
Mortgage loans	11,547	17,992
Net cash used by investing activities	(112,515)	(173,967)
Cash flow from financing activities:
Borrowings from credit facilities	26,187	58,558
Principal repayments on credit facilities	(61,142)	(42,252)
Debt issuance costs		(560)
Capital lease payments	(3,888)	(1,727)
Leveraged Employee Stock Ownership Plan - repayments from loan	162	280
Securitization deposits	(908)	27,953
Preferred stock redemption paid		(144,289)
Preferred stock dividends paid		(3,077)
Contribution to related party		(518)
Investment contract deposits	28,993	2,588
Investment contract withdrawals	(7,967)	(8,195)
Net cash used by financing activities	(18,563)	(111,239)
Effects of exchange rate on cash	(376)	44
Increase (decrease) in cash and cash equivalents	216,139	(131,743)
Cash and cash equivalents at the beginning of period	350,100	375,496
Cash and cash equivalents at the end of the period	566,239	243,753
Fixed maturities investments
Purchase of:
Payments to acquire investments	(50,553)	(75,059)
Proceeds from sale of:
Proceeds from sale of acquired investments	23,978	66,035
Preferred stock investments
Purchase of:
Payments to acquire investments		(541)
Proceeds from sale of:
Proceeds from sale of acquired investments	$ 1,003	$ 1,000