Derivative Financial Instruments (Schedule Of Derivatives Not Designated As Hedging Instruments, Location In Consolidated Statements Of Operations) (Details) (Derivatives Not Designated As Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized into Income on Derivative	$ (223)	$ (1,700)
Interest Rate Swap Contracts [Member] | Cost Of ATM Operating Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized into Income on Derivative	(171)	(1,574)
Interest Rate Swap Contracts [Member] | Other (Income) Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized into Income on Derivative	$ (52)	$ (126)