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Employee Benefit Plans (Details 5)	12 Months Ended
Employee Benefit Plans (Details 5)	Dec. 31, 2012	Dec. 31, 2011
Target Allocation	100.00%
Percentage of Plan Assets	100.00%	100.00%
Weighted-Average Expected Long-Term Rate of Return	7.75%	7.75%
Equity Securities [Member]
Target Allocation	40.00%
Percentage of Plan Assets	41.00%	40.00%
Weighted-Average Expected Long-Term Rate of Return	5.50%
Debt Securities [Member]
Target Allocation	50.00%
Percentage of Plan Assets	50.00%	51.00%
Weighted-Average Expected Long-Term Rate of Return	1.80%
Others [Member]
Target Allocation	10.00%
Percentage of Plan Assets	9.00%	9.00%
Weighted-Average Expected Long-Term Rate of Return	0.50%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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