Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flow from operating activities:
Net earnings	$ 124,474	$ 112,968
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	84,010	68,999
Amortization of deferred policy acquisition costs	4,184	3,683
Change in allowance for losses on trade receivables	22	(14)
Change in allowance for inventory reserves	(1,760)	(935)
Net gain on sale of real and personal property	(22,959)	(11,565)
Net (gain) loss on sale of investments	(874)	(1,776)
Deferred income tax	12,407	31,828
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(717)	(22,715)
Inventories	(561)	(973)
Prepaid expenses	5,368	14,098
Capitalization of deferred policy acquisition costs	(6,575)	(7,808)
Other assets	(6,814)	(4,532)
Related party assets	8,089	24,878
Accounts payable and accrued expenses	94,004	18,162
Policy benefits and losses, claims and loss expenses payable	(9,878)	1,609
Other policyholders' funds and liabilities	1,827	(180)
Deferred income	7,683	7,584
Related party liabilities	1,878	5,962
Net cash provided by operating activities	293,808	239,273
Purchase of:
Property, plant and equipment	(343,988)	(275,156)
Short term investments	(62,293)	(64,652)
Fixed maturities investments	(69,426)	(66,855)
Equity securities	(3,281)	(388)
Preferred stock	(2)	(634)
Real estate	(4,211)	(131)
Mortgage loans	(5,069)	(9,798)
Proceeds from sale of:
Property, plant and equipment	128,989	93,239
Short term investments	62,631	64,818
Fixed maturities investments	25,624	41,491
Equity securities	2,009	904
Preferred stock	1,000	3,295
Mortgage loans	12,069	20,152
Net cash used by investing activities	(255,948)	(193,715)
Cash flow from financing activities:
Borrowings from credit facilities	207,152	88,182
Principal repayments on credit facilities	(52,464)	(61,996)
Debt issuance costs	(2,422)	(232)
Capital lease payments	(18,007)	(10,449)
Leveraged Employee Stock Ownership Plan - repayments from loan	87	127
Investment contract deposits	37,892	34,742
Investment contract withdrawals	(11,551)	(6,754)
Net cash provided by financing activities	160,687	43,620
Effects of exchange rate on cash	(1,074)	(335)
Increase (decrease) in cash and cash equivalents	197,473	88,843
Cash and cash equivalents at the beginning of period	495,112	463,744
Cash and cash equivalents at the end of the period	$ 692,585	$ 552,587