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Risk Management and Derivatives (Qualifying cash flow hedges) (Details) (USD $)			9 Months Ended
	Sep. 30, 2013 Cash flow interest rate cap	Sep. 30, 2013 Interest rate swap	Sep. 30, 2013 Interest rate cap and interest rate swap	Sep. 30, 2013 Terminated interest rate swap	Sep. 30, 2013 Foreign currency derivatives	Dec. 31, 2012 Foreign currency derivatives	Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member] Interest rate swap
Derivative [Line Items]
Notional Amount	$ 500,000,000	$ 28,000,000
Variable Rate							2.00%
Interest Rate Cap, Fixed Rate	1.00%
Interest Rate Swap, Fixed Rate		3.47%
Expense (income) related to qualifying cash flow hedges expected to be reclassified to earnings over the next 12 months			400,000	(200,000)
Foreign currency derivative collateral included in restricted cash					$ 10,200,000	$ 9,600,000

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments.

+ References

No definition available.

+ Details

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X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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X

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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X

- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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