Other Comprehensive Income (Loss) (Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Comprehensive Income (Loss) Components and Tax Effects [Line Items]
Net Unrealized Gain (Loss) on Marketable Securities before Taxes	$ 101	$ 68
Net unrealized gain (loss) on hedging instruments	(1,048)	(19,319)
Other comprehensive income (loss)	(947)	(19,251)
Less other comprehensive income attributable to noncontrolling interest	(275)	(454)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Stockholders	(672)	(18,797)
Net Unrealized Gain (loss) on Marketable Securities, Tax	40	27
Net unrealized gain (loss) on hedging instruments, tax expense (benefit)	(301)	(7,302)
Other comprehensive income, tax expense	(261)	(7,275)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Stockholders	(261)	(7,275)
Net unrealized gain (loss) on marketable securities, after tax	61	41
Net unrealized gain (loss) on hedging instruments, after tax	(747)	(12,017)
Other comprehensive income (loss), net of tax	(686)	(11,976)
Less other comprehensive income attributable to noncontrolling interest, after tax	(275)	(454)
Other Comprehensive Income (Loss) Portion Attributable to Stockholders	$ (411)	$ (11,522)