Fair Value and Derivative Financial Instruments Fair Value and Derivative Financial Instruments (Notional Amounts) (Details) (Forward Contracts [Member]) In Thousands, unless otherwise specified	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)
Derivative [Line Items]
Notional amounts of forward contracts	$ 52,020	€ 19,500	$ 50,550	€ 8,250

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant