Quarterly report pursuant to Section 13 or 15(d)

Hedging Activities (Narrative) (Details)

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Hedging Activities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2012
General Discussion of Derivative Instruments and Hedging Activities [Abstract]        
Expected to reclassify out of accumulated other comprehensive income for the remainder of the year       $ 6,921
Gain on Fair Value Hedge Ineffectiveness $ 345 $ 79 $ 0