Fair Value Of Financial Instruments, Derivative And Marketable Securities (Interest Rate Derivatives) (Details)			12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 JPY (¥)	Dec. 31, 2014 Swap 3 [Member] USD ($)		Dec. 31, 2014 Swap 3 [Member] JPY (¥)
Derivative [Line Items]
Effective Date			Mar. 15, 2009		Mar. 15, 2009
Termination Date			Sep. 15, 2020		Sep. 15, 2020
Derivatives, current notional amount	$ 31,451,000	¥ 3,300,000,000	$ 37,593	[1]
Swap Rate (in thousandths)			2.065%		2.065%
Type			Variable-to-Fixed		Variable-to-Fixed
Exchange rate		102.53			119.72

[1] Notional Amount converted from Yen at December 31, 2014 at a Yen to USD exchange rate of 119.72.