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Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of (gains) losses related to assets and liabilities denominated in foreign currencies
Net realized foreign currency losses (gains)	$ 5,630	$ (2,130)	$ 1,144	$ (8,720)
Net (gains) losses from the related forward contracts	(5,267)	4,440	(1,302)	12,525
Net losses (gains) from foreign currency transactions and related forward contracts	$ 363	$ 2,310	$ (158)	$ 3,805

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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