Derivative Financial Instruments Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Liability Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability	$ 2,800	$ 222
Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign exchange forward contracts asset	57	241
Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts liability	103	222
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Interest Rate Derivative Liabilities, at Fair Value	256	0
Designated as Hedging Instrument [Member] | Other Long Term Obligations [Member]
Liability Derivatives [Abstract]
Interest Rate Derivative Liabilities, at Fair Value	$ 2,441	$ 0