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Risk Management and Derivatives (Outstanding foreign currency derivatives - non-designated hedge) (Details)	3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 Sells EUR/Buys USD Forward USD ($)	Sep. 30, 2013 Sells EUR/Buys USD Forward EUR (€)	Sep. 30, 2013 Sells GBP/Buys USD Forward USD ($)	Sep. 30, 2013 Sells GBP/Buys USD Forward GBP (£)	Sep. 30, 2013 Sells CAD/Buys USD Forward USD ($)	Sep. 30, 2013 Sells CAD/Buys USD Forward CAD	Sep. 30, 2013 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($)	Sep. 30, 2012 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($)	Sep. 30, 2013 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($)	Sep. 30, 2012 Foreign exchange contracts Other Expense Not Designated as Hedging Instrument USD ($)
Derivative [Line Items]
Notional Amount					$ 114,155,000	€ 84,400,000	$ 44,512,000	£ 27,500,000	$ 41,832,000	43,100,000
Derivative instruments, gain (loss) recognized in income, net											(7,992,000)	(6,658,000)	1,750,000	(5,326,000)
Gain (loss) on foreign investments	$ (1,100,000)	$ (500,000)	$ (1,500,000)	$ (800,000)

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959



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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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