Fair Value Of Financial Instruments (Quantitative Information related To The Significant Unobservable Inputs Utilized In Company's Level 3 Recurring Fair Value Measurements) (Details) - Discounted Cash Flow [Member]	9 Months Ended
	Sep. 30, 2015
Auction Rate Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range, low end	2.30%
Discount rate range, high end	13.50%
Workout period range, low end	1 year
Workout period range, high end	3 years
Discount rate, weighted average	7.70%
Weighted average workout period	2 years 6 months
Auction Rate Municipal Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate range, low end	0.30%
Discount rate range, high end	8.80%
Workout period range, low end	1 year
Workout period range, high end	4 years
Discount rate, weighted average	7.10%
Weighted average workout period	2 years 9 months 18 days