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Derivative Instruments and Hedging Activities (Effect of Derivative Financial Instruments on the Statements of Income and Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 29,791,000		$ 29,791,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Amount of (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion)	(2,200,000)	(7,400,000)
Cash Flow Hedging [Member] | Loss On Discontinuation Of Hedging Relationship [Member]
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	29,800,000
Cash Flow Hedging [Member] | Interest Expense [Member]
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)	4,000,000	5,800,000
Non-designated [Member] | Interest Rate Cap [Member] | Other Income Expense [Member]
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	0
Interest Rate Swap [Member]
Amount of (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative (Effective Portion)			(2,700,000)	(14,200,000)
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0
Loss On Discontinuation Of Hedging Relationship [Member]
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Location of Loss Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)			29,800,000
Interest Expense [Member]
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)			$ 9,800,000	$ 11,700,000

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The income statement location of the effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 3

+ Details

Name:	us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of loss 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

+ Details

Name:	us-gaap_DerivativeInstrumentsLossRecognizedInIncome
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 2

+ Details

Name:	us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration