Fair-Value Measurements (Schedule of (Losses)/Gains on Changes in Fair Value of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains recognized in other comprehensive income	$ 279	[1]	$ (211)	[1]
Foreign Exchange Options [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses)/gains recognized in income, net		[2]	$ (1)	[2]

[1] Unrealized losses are recognized in Other comprehensive income, net of tax. This derivative was a 100% effective hedge of interest rate cash flow risk for the quarter ended March 31, 2013.

[2] Gains/(losses) are recognized in Other expense, net.