Fair Value Of Financial Instruments (Quantitative Information related To The Significant Unobservable Inputs Utilized In Company's Level 3 Recurring Fair Value Measurements) (Details) - Jun. 30, 2015	Total
Discounted Cash Flow [Member] | 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	13.40%
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 4 months 24 days
Discounted Cash Flow [Member] | 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	8.40%
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
Minimum [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	1.3
EBITDA multiple	9.4
Maximum [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	3.0
EBITDA multiple	11.3
Weighted Average [Member] | Market Approach [Member] | Investments In Partnerships [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue multiple	2.1
EBITDA multiple	8.9