Derivative Instruments and Hedging Activities (Details 1) (Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Derivative instruments gain (loss) in financial statements
Gain (loss) recognized in OCI (effective portion)	$ (7,472)	$ (4,260)
Gain (loss) reclassified from accumulated OCI, effective amount	(9,947)	(10,437)
Gain (loss) reclassified from accumulated OCI, ineffective amount	(15)	(3,666)
Interest rate caps and interest rate swaps [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) recognized in OCI (effective portion)	(7,472)
Interest rate caps and interest rate swaps [Member] \| Interest expense [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) reclassified from accumulated OCI, effective amount	(8,957)
Gain (loss) reclassified from accumulated OCI, ineffective amount	(14)
Interest rate caps and interest rate swaps [Member] \| Earnings (loss) from Unconsolidated Entities, Gross of Tax [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) reclassified from accumulated OCI, effective amount	(990)
Gain (loss) reclassified from accumulated OCI, ineffective amount	(1)
Interest rate caps, interest rate swaps and treasury options [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) recognized in OCI (effective portion)		(4,260)
Interest rate caps, interest rate swaps and treasury options [Member] \| Interest expense [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) reclassified from accumulated OCI, effective amount		(9,437)
Gain (loss) reclassified from accumulated OCI, ineffective amount		0
Interest rate caps, interest rate swaps and treasury options [Member] \| Earnings (loss) from Unconsolidated Entities, Gross of Tax [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) reclassified from accumulated OCI, effective amount		(1,000)
Gain (loss) reclassified from accumulated OCI, ineffective amount		0
Interest rate caps, interest rate swaps and treasury options [Member] \| Discontinued operations [Member]
Derivative instruments gain (loss) in financial statements
Gain (loss) reclassified from accumulated OCI, effective amount		0
Gain (loss) reclassified from accumulated OCI, ineffective amount		$ (3,666)

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The effective portion of net gain (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 Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959

+ Details

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1),(2)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

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

+ References

+ Details

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- Details

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