Derivative Financial Instruments (Details 1) (Not Designated as Hedging Instrument [Member], Interest rate caps [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012
1.25% Strike Rate Derivatives [Member]
Interest rate derivatives designated and non designated
Derivative Maturity Period	May 01, 2013
Strike Rate	1.25%
Notional Amount of Hedge	$ 51,982
Cost of Hedge	196
Estimate Fair Value
1.75% Strike Rate Derivatives [Member]
Interest rate derivatives designated and non designated
Derivative Maturity Period	May 01, 2014
Strike Rate	1.75%
Notional Amount of Hedge	51,982
Cost of Hedge	434
Estimate Fair Value	$ 1

Aggregate notional amount of all interest rate derivatives not designated as hedging instruments. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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

Name:	us-gaap_NotionalAmountOfInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant