Derivatives and Hedging Activities (Details) (Cash Flow Hedging [Member], Interest Rate Cap [Member], Interest Expense [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Cash Flow Hedging [Member] \| Interest Rate Cap [Member] \| Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Reclassification period from other comprehensive income as an increase to interest expense	12 months
Reclassified from other comprehensive income as an increase to interest expense	$ 13

Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration