CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in unrealized gains (losses) - taxes (benefits)	$ 30,788	$ (11,379)	$ 23,934
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	(4,014)	(4,175)	4,178
Changes in market value of derivatives - taxes (benefits)	(20,497)	(58,332)	(3,095)
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	15,460	(475)	907
Actuarial loss on pension plans, tax benefit	$ (5,490)	$ (11,410)	$ (1,392)

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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- Definition

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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