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Summary of Significant Accounting Policies Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Derivative, Notional Amount	$ 3,457	$ 2,672
Derivative Instruments, Loss (Gain) Recognized in Income, Net	(112)	256	93
Derivative Asset, Fair Value, Gross Asset	268	99
Notional Amount of Foreign Currency Derivatives	$ 3,340	$ 2,950	$ 1,200

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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