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Derivatives (Narrative) (Details) (USD $)	6 Months Ended			6 Months Ended
Derivatives (Narrative) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2011 Maximum [Member]
Maximum length of time to hedge, months	12 months
Remaining contract maturity, years				1 year	1 year
Foreign exchange gross notional amount	$ 10,700,000		$ 9,200,000
Unrealized losses on effective portion of foreign exchange forward contracts, net	46,000	323,000
Foreign exchange forward contracts	$ (70,000)	$ (493,000)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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