Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt [Abstract]

Selected Information About Debt Issues

						As of December 31,
						2011								2010
Instrument	Annual Percentage Rate			Issue Date	Periodic Interest Payments Due	Outstanding Principle (Par Value)		Outstanding Principle (Book Value)			Outstanding Principle (Fair Value)			Outstanding Principle (Book Value)
Notes, due 5/15/23(1)(2)		7.875	%	5/93	5/15 & 11/15	$	165,612	$	163,344		$	195,654		$	163,227
Notes, due 8/1/13(1)(2)		7.375	%	7/93	2/1 & 8/1		94,050		93,823			100,302			93,700
Senior Notes, due 6/15/16(1)(8)		6.375	%	6/06	6/15 & 12/15		250,000		247,875			275,910			247,477
Senior Notes, due 6/15/19(1)(8)		9.250	%	6/09	6/15 & 12/15		292,647		289,661			375,276			289,397
Issue Expenses(3)							0		(4,132	)		0			(4,158	)
Subtotal long-term debt							802,309		790,571			947,142			789,643
Junior Subordinated
Debentures due 6/1/46(4)(5)		7.100	%	6/06	quarterly(6)		123,711		123,711			122,208	(7)		123,711
Total funded debt							926,020		914,282			1,069,350			913,354
Commercial Paper(9)							225,000		224,842			224,842			198,875
						$	1,151,020	$	1,139,124		$	1,294,192		$	1,112,229

(1) All securities other than the Junior Subordinated Debentures have equal priority with one another.

(2) Not callable.

(3) Unamortized issue expenses related to Trust Preferred Securities.

(4) Junior Subordinated Debentures are classified as "Due to affiliates" and are junior to other securities in priority of payment.

(5) Callable anytime

(6) Quarterly payments on the first day of March, June, Sept., and Dec.

(7) Fair value of Trust Preferred Securities.

(8) Callable subject to "make-whole" premium.

(9) Classified as short-term debt.