Derivative Financial Instruments (Fair Value of Derivative Instruments as Recorded in Consolidated Balance Sheets) (Details) (Derivatives Designated as Hedging Instruments, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Derivatives, Fair Value [Line Items]
Total derivatives designated as hedging instruments, asset derivatives	$ 1,090	$ 0	$ 257
Total derivatives designated as hedging instruments, asset derivatives	0	460	878
Prepaid Expenses and Other
Derivatives, Fair Value [Line Items]
Interest rate swap agreements, asset derivatives	64	0	0
Foreign currency exchange contracts, asset derivatives	326	0	257
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Interest rate swap agreements, asset derivatives	700	0	0
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap agreements, liability derivatives	0	456	878
Foreign currency exchange contracts, liability derivatives	$ 0	$ 4	$ 0