Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Unrealized holding gains (losses) on available-for-sale securities, tax (expense) benefit	$ (4)	$ 92	$ 0	$ 23
Unrealized derivative holding gains (losses) arising during period, tax (expense) benefit	286	(1,561)	11	(512)
Reclassification to net income of previously deferred (gains) losses on derivative instruments, tax expense (benefit)	539	(812)	566	(1,142)
Foreign currency translation adjustment, tax (expense) benefit	$ (149)	$ 885	$ 111	$ (671)

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change 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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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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