Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
ASSETS:
Cash and cash equivalents	$ 350,100	$ 375,496
Reinsurance recoverables and trade receivables, net	297,974	220,650
Inventories, net	58,735	59,942
Prepaid expenses	41,858	57,624
Investments, fixed maturities and marketable equities	766,792	659,809
Investments, other	265,631	201,868
Deferred policy acquisition costs, net	63,914	52,870
Other assets	120,525	166,633
Related party assets	316,157	301,968
Subtotal assets	2,281,686	2,096,860
Property, plant and equipment, at cost:
Land	281,140	239,177
Buildings and improvements	1,087,119	1,024,669
Furniture and equipment	308,120	310,671
Property, plant and equipment (gross)	3,787,822	3,435,980
Less: Accumulated depreciation	(1,415,457)	(1,341,407)
Total property, plant and equipment	2,372,365	2,094,573
Total assets	4,654,051	4,191,433
Liabilities:
Accounts payable and accrued expenses	335,326	304,006
Notes, loans and leases payable	1,486,211	1,397,842
Policy benefits and losses, claims and loss expenses payable	1,145,943	934,234
Liabilities from investment contracts	240,961	255,134
Other policyholders' funds and liabilities	7,273	8,731
Deferred income	31,525	27,209
Deferred income taxes	370,992	271,257
Total liabilities	3,618,231	3,198,413
Commitments and contingencies (notes 9, 18, 19, 20 and 21)
Stockholders' equity:
Additional paid-in capital	433,743	425,212
Accumulated other comprehensive loss	(45,436)	(46,467)
Retained earnings	1,317,064	1,140,002
Unearned employee stock ownership plan shares	(2,398)	(3,382)
Total stockholders' equity	1,035,820	993,020
Total liabilities and stockholders' equity	4,654,051	4,191,433
Series A preferred stock, with no par value, 6,100,000 authorized; 6,100,000 and 5,791,700 shares issued and none and 5,791,700 outstanding as of March 31, 2012 and 2011
Stockholders' equity:
Preferred stock, value, issued
Series B preferred stock, with no par value, 100,000 shares authorized; none issued and outstanding as of March 31, 2012 and 2011
Stockholders' equity:
Preferred stock, value, issued
Series A common stock of $0.25 par value, 10,000,000 shares authorized; none issued and outstanding as of March 31, 2012 and 2011
Stockholders' equity:
Common stock, value, issued
Common stock of $0.25 par value, 150,000,000 shares authorized; 41,985,700 issued and 19,607,788 outstanding as of March 31, 2012 and 2011
Stockholders' equity:
Common stock, value, issued	10,497	10,497
Cost of common shares in treasury, net (22,377,912 shares as of March 31, 2012 and 2011)
Stockholders' equity:
Treasury stock, value	(525,653)	(525,653)
Cost of preferred shares in treasury, net (6,100,000 and 308,300 shares as of March 31, 2012 and 2011)
Stockholders' equity:
Treasury stock, value	(151,997)	(7,189)
Rental trailers and other rental equipment
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	255,010	249,700
Rental trucks
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 1,856,433	$ 1,611,763