Accumulated Other Comprehensive Income (Changes in accumulated other comprehensive income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Balance at January 1:	$ 7,587	$ 19,026
Other comprehensive income before reclassification	(9,911)	(1,736)
Amounts reclassified from accumulated other comprehensive income	(1,514)	(3,787)
New current-period other comprehensive income	(11,425)	(5,523)
Balance at March 31:	$ (3,838)	$ 13,503

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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-Name Regulation S-X (SX)

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-Name Accounting Principles Board Opinion (APB)

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+ Details

- Definition

Net of tax amount, before reclassification adjustments, 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).

+ References

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+ Details