Financial Instruments And Investments (Contractual Year For Maturity Of Available-For-Sale Securities ) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Collateralized Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Contractual Maturity Due For, Mortgaged Backed Securities	10 years
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Total	$ 30,301
2015	0
2016 through 2019	10,193
2020 through 2024	13,526
2025 and Beyond	6,582
Corporate Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Total	20,084
2015	697
2016 through 2019	5,720
2020 through 2024	7,594
2025 and Beyond	6,073
U.S. Government Bonds
Schedule of Available-for-sale Securities [Line Items]
Total	45,027
2015	3,051
2016 through 2019	15,666
2020 through 2024	16,844
2025 and Beyond	$ 9,466
Minimum | Collateralized Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Expected Weighted Average Maturity Year	2 years
Maximum | Collateralized Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Expected Weighted Average Maturity Year	6 years