Financial Instruments And Investments (Contractual Year For Maturity Of Available-For-Sale Securities ) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
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	$ 30,767
2014	401
2015 through 2018	12,787
2019 through 2023	13,939
2024 and Beyond	3,640
Corporate Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Total	14,105
2014	0
2015 through 2018	3,311
2019 through 2023	6,422
2024 and Beyond	4,372
U.S. Government Bonds
Schedule of Available-for-sale Securities [Line Items]
Total	28,829
2014	1,202
2015 through 2018	14,341
2019 through 2023	6,524
2024 and Beyond	$ 6,762
Maximum
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Expected Weighted Average Maturity Year	8 years
Minimum
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Expected Weighted Average Maturity Year	3 years