Derivatives (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

The following table provides a detail of the swaps outstanding and the related hedged items as of March 31, 2012:

	Maturity date	Face value of medium-term notes	Aggregate  notional amount of interest rate swaps	Fixed interest  rate	Weighted-average variable interest rate on hedged debt as of March 31,
Issuance date					2012	2011
		(Dollars in thousands)
May 2011	June 2017	$350,000	$150,000	3.50%	1.84%	NA
February 2011	March 2015	$350,000	$150,000	3.15%	1.70%	1.42%
February 2008	March 2013	$250,000	$250,000	6.00%	2.88%	2.59%

Impact on the Consolidated Condensed Statements of Earnings related to Fair Value Hedges

Fair Value Hedging Relationship	Location of  Gain (Loss) Recognized in Income	Three months ended March 31,
		2012			2011
		(In thousands)
Derivatives: Interest rate swaps	Interest expense	$	(2,170	)	(1,149	)
Hedged items: Fixed-rate debt	Interest expense	2,170			1,149
Total		$	—		—