Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income
Unrealized holding gains (losses) arising during the period, tax provision (benefit)	$ 110,277	$ (42,585)	$ 66,835
Reclassification adjustment for gains (losses) included in net income (loss), tax provision (benefit)	(7,358)	(2,829)	1,435
Change in cumulative translation adjustment, tax provision (benefit)	(407)	(229)	(759)
Change in cash flow hedge, tax provision (benefit)	$ (225)	$ (225)	$ (225)

Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. 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 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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- Definition

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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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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