Financial Instruments And Investments (Marketable Securities Fair Value And Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 securities		Dec. 31, 2012 securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	$ 32,433	[1]	$ 17,786	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(971)	[1]	(543)	[2]
Marketable Securities Fair Value 12 Months or Longer	20,970	[1]	10,633	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(1,492)	[1]	(364)	[2]
Marketable Securities Fair Value, Total	53,403	[1]	28,419	[2]
Marketable Securities Unrealized Losses, Total	(2,463)	[1]	(907)	[2]
Number of securities	122		65
Collateralized Mortgage Backed Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	6,444	[1]	1,792	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(169)	[1]	(5)	[2]
Marketable Securities Fair Value 12 Months or Longer	1,421	[1]	416	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(119)	[1]	(9)	[2]
Marketable Securities Fair Value, Total	7,865	[1]	2,208	[2]
Marketable Securities Unrealized Losses, Total	(288)	[1]	(14)	[2]
U.S. Government Bonds
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	8,114	[1]	6,633	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(245)	[1]	(79)	[2]
Marketable Securities Fair Value 12 Months or Longer	10,866	[1]	4,457	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(840)	[1]	(114)	[2]
Marketable Securities Fair Value, Total	18,980	[1]	11,090	[2]
Marketable Securities Unrealized Losses, Total	(1,085)	[1]	(193)	[2]
Municipal Bonds
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	12,286	[1]	5,306	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(335)	[1]	(39)	[2]
Marketable Securities Fair Value 12 Months or Longer	7,782	[1]	5,760	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(479)	[1]	(241)	[2]
Marketable Securities Fair Value, Total	20,068	[1]	11,066	[2]
Marketable Securities Unrealized Losses, Total	(814)	[1]	(280)	[2]
Corporate Debt Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	3,284	[1]	452	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(96)	[1]	(11)	[2]
Marketable Securities Fair Value 12 Months or Longer	901	[1]	0	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(54)	[1]	0	[2]
Marketable Securities Fair Value, Total	4,185	[1]	452	[2]
Marketable Securities Unrealized Losses, Total	(150)	[1]	(11)	[2]
Debt Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	30,128	[1]	14,183	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(845)	[1]	(134)	[2]
Marketable Securities Fair Value 12 Months or Longer	20,970	[1]	10,633	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(1,492)	[1]	(364)	[2]
Marketable Securities Fair Value, Total	51,098	[1]	24,816	[2]
Marketable Securities Unrealized Losses, Total	(2,337)	[1]	(498)	[2]
Equity Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value, Less than 12 Months	2,305	[1]	3,603	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(126)	[1]	(409)	[2]
Marketable Securities Fair Value 12 Months or Longer	0	[1]	0	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	0	[1]	0	[2]
Marketable Securities Fair Value, Total	2,305	[1]	3,603	[2]
Marketable Securities Unrealized Losses, Total	$ (126)	[1]	$ (409)	[2]

[1] Includes approximately 122 securities.

[2] Includes approximately 65 securities.