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Derivative Information (Details 3) (Interest rate swaps, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Effect of cash flow hedges on financial statements
Amount Recognized (Ineffective Portion)	$ 1,500
Cash flow hedges
Effect of cash flow hedges on financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	89
Swap Interest Reclassified From Accumulated Other Comprehensive Income (Effective Portion)	4,672
Amount Recognized (Ineffective Portion)	$ 1,511

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 portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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.

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