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Derivative Instruments (Details 3) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Effects of derivative instruments
Amount of Loss Recognized on Derivatives in the Statements of Income	$ 366	$ 2,448
Interest rate contracts \| Interest expense
Effects of derivative instruments
Amount of Loss Recognized on Derivatives in the Statements of Income	$ 366	$ 2,448

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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