Interest rate swap agreements (Tables)

6 Months Ended

Jun. 30, 2012

Interest rate swap agreements

Schedule of effective portion of the unrealized loss recognized in other comprehensive income for interest rate swaps

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Unrealized loss recognized in other comprehensive loss related to the effective portion of changes in the fair value of our interest rate swap agreements	$	3,091	$	5,555	$	7,164	$	5,255

Schedule of the location in the consolidated statements of income and the effective portion of the loss reclassified from accumulated other comprehensive income into earnings for cash flow hedge contract

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Loss reclassified from accumulated other comprehensive income to earnings as an increase to interest expense (effective portion)	$	5,895	$	5,302	$	11,670	$	10,741

Outstanding interest rate hedge agreements designated as cash flow hedges of interest rate risk

								Notional Amount in Effect as of
Transaction Date	Effective Date	Termination Date	Interest Pay Rate (1)		Fair Value as of June 30, 2012			June 30, 2012		December 31, 2013		December 31, 2014
December 2006	December 29, 2006	March 31, 2014	4.990	%	$	(4,098	)	$	50,000	$	50,000	$	–
October 2007	October 31, 2007	September 30, 2012	4.546		(543		)	50,000		–		–
October 2007	October 31, 2007	September 30, 2013	4.642		(2,738		)	50,000		–		–
October 2007	July 1, 2008	March 31, 2013	4.622		(817		)	25,000		–		–
October 2007	July 1, 2008	March 31, 2013	4.625		(818		)	25,000		–		–
December 2006	November 30, 2009	March 31, 2014	5.015		(6,180		)	75,000		75,000		–
December 2006	November 30, 2009	March 31, 2014	5.023		(6,191		)	75,000		75,000		–
December 2006	December 31, 2010	October 31, 2012	5.015		(1,639		)	100,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.480		(275		)	250,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.480		(275		)	250,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.480		(137		)	125,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.480		(137		)	125,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.495		(147		)	125,000		–		–
December 2011	December 30, 2011	December 31, 2012	0.508		(155		)	125,000		–		–
December 2011	December 31, 2012	December 31, 2013	0.640		(672		)	–		250,000		–
December 2011	December 31, 2012	December 31, 2013	0.640		(672		)	–		250,000		–
December 2011	December 31, 2012	December 31, 2013	0.644		(341		)	–		125,000		–
December 2011	December 31, 2012	December 31, 2013	0.644		(341		)	–		125,000		–
December 2011	December 31, 2013	December 31, 2014	0.977		(1,150		)	–		–		250,000
December 2011	December 31, 2013	December 31, 2014	0.976		(1,148		)	–		–		250,000
Total					$	(28,474	)	$	1,450,000	$	950,000	$	500,000

(1) In addition to the interest pay rate, borrowings outstanding under our unsecured senior line of credit and unsecured senior bank term loans include an applicable margin currently ranging from 1.20% to 1.65%.