Summary Of Significant Accounting Policies (Significant Unobervable Inputs in Asset Valuation) (Details)	Dec. 31, 2012
Weighted average cost of capital, Weighted Average	7.80%
Long-term pre-tax operating margin (cash basis), Weighted Average	7.20%
Minimum [Member]
Weighted average cost of capital, Range	7.50%
Long-term pre-tax operating margin (cash basis), Range	6.10%
Maximum [Member]
Weighted average cost of capital, Range	8.00%
Long-term pre-tax operating margin (cash basis), Range	7.80%