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Interest rate swap agreements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest rate swap agreements
The percentage of effectiveness of interest rate swap agreements	100.00%	100.00%	100.00%	100.00%
Cash flow hedges
Interest rate hedge agreements
Unrealized loss recognized in other comprehensive loss	2,818	2,822	9,982	8,077
Cash flow hedges \| Interest expense
Interest rate hedge agreements
Loss reclassified from accumulated other comprehensive income to earnings	5,956	5,381	17,626	16,121

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details