Financial Instruments And Investments (Marketable Securities Fair Value And Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014 securities		Dec. 31, 2013 securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	$ 3,537	[1]	$ 32,433	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(56)	[1]	(971)	[2]
Marketable Securities Fair Value 12 Months or Longer	35,154	[1]	20,970	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(1,610)	[1]	(1,492)	[2]
Marketable Securities Fair Value Total	38,691	[1]	53,403	[2]
Marketable Securities Unrealized Losses Total	(1,666)	[1]	(2,463)	[2]
Number of securities	97		122
Debt Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	3,020	[1]	30,128	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(50)	[1]	(845)	[2]
Marketable Securities Fair Value 12 Months or Longer	34,744	[1]	20,970	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(1,577)	[1]	(1,492)	[2]
Marketable Securities Fair Value Total	37,764	[1]	51,098	[2]
Marketable Securities Unrealized Losses Total	(1,627)	[1]	(2,337)	[2]
Collateralized Mortgage Backed Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	0	[1]	6,444	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	0	[1]	(169)	[2]
Marketable Securities Fair Value 12 Months or Longer	2,422	[1]	1,421	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(110)	[1]	(119)	[2]
Marketable Securities Fair Value Total	2,422	[1]	7,865	[2]
Marketable Securities Unrealized Losses Total	(110)	[1]	(288)	[2]
U.S. Government Bonds
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	0	[1]	8,114	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	0	[1]	(245)	[2]
Marketable Securities Fair Value 12 Months or Longer	15,900	[1]	10,866	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(792)	[1]	(840)	[2]
Marketable Securities Fair Value Total	15,900	[1]	18,980	[2]
Marketable Securities Unrealized Losses Total	(792)	[1]	(1,085)	[2]
Municipal Bonds
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	2,520	[1]	12,286	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(46)	[1]	(335)	[2]
Marketable Securities Fair Value 12 Months or Longer	14,608	[1]	7,782	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(621)	[1]	(479)	[2]
Marketable Securities Fair Value Total	17,128	[1]	20,068	[2]
Marketable Securities Unrealized Losses Total	(667)	[1]	(814)	[2]
Corporate Debt Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	500	[1]	3,284	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(4)	[1]	(96)	[2]
Marketable Securities Fair Value 12 Months or Longer	1,814	[1]	901	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(54)	[1]	(54)	[2]
Marketable Securities Fair Value Total	2,314	[1]	4,185	[2]
Marketable Securities Unrealized Losses Total	(58)	[1]	(150)	[2]
Equity Securities
Financial Instruments and Investments [Line Items]
Marketable Securities Fair Value Less than 12 Months	517	[1]	2,305	[2]
Marketable Securities Unrealized Losses Less Than 12 Months	(6)	[1]	(126)	[2]
Marketable Securities Fair Value 12 Months or Longer	410	[1]	0	[2]
Marketable Securities Unrealized Losses 12 Months or Longer	(33)	[1]	0	[2]
Marketable Securities Fair Value Total	927	[1]	2,305	[2]
Marketable Securities Unrealized Losses Total	$ (39)	[1]	$ (126)	[2]

[1] Includes approximately 97 securities.

[2] Includes approximately 122 securities.