Financial Instruments And Investments (Contractual Year For Maturity Of Available-For-Sale Securities ) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 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	$ 30,135
2014	976
2015 through 2018	13,279
2019 through 2023	12,562
2024 and Beyond	3,318
Corporate Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Total	13,791
2014	317
2015 through 2018	3,324
2019 through 2023	5,963
2024 and Beyond	4,187
U.S. Government Bonds
Schedule of Available-for-sale Securities [Line Items]
Total	27,395
2014	1,210
2015 through 2018	14,347
2019 through 2023	6,434
2024 and Beyond	$ 5,404
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