Financial Instruments (Effect Of Derivatives On Consolidated Condensed Statements Of Operations And Comprehensive Income) (Details) - Derivatives designated as hedging instruments [Member] - Interest rate contracts [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized in income		$ 385	$ 239	$ 1,173	$ 740
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain on hedging instrument	[1]	$ 385	$ 239	$ 1,173	$ 740

[1] Realized gain on hedging instrument consists of net cash settlements and interest accruals on the interest rate swaps during the periods. Net cash settlements are included in the supplemental cash flow information within interest, net of amounts capitalized in the Condensed Consolidated Statements of Cash Flows.