Fair Value Measurement (Details 1) (Interest rate caps [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Interest rate caps [Member]
Reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance of recurring Level 3 assets at beginning of period	$ 436	$ 1,933
Total gains (losses) for the period
Included in other income	138	(157)
Included in other comprehensive income
Purchases
Amortization	(130)	(130)
Sales
Balance of recurring Level 3 assets at end of period	$ 444	$ 1,646

Fair value measurement with unobservable inputs reconciliation recurring basis asset amortization.

No definition available.

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Period Type:	duration

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset gain (loss) included in other income (loss).

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

+ Details

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- Definition

Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

+ Details

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Period Type:	duration

- Definition

Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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.

+ Details

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