Interest Rate Derivative Agreements Footnote Tagging (Details) (USD $)	3 Months Ended
Mar. 31, 2013 derivatives	Mar. 31, 2012
Derivative [Line Items]
Number of Derivatives	3
Derivative, Loss on Derivative	$ 105,000	$ 329,000

Decrease in the fair value of the derivative or group of derivatives included in earnings in the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

Name:	us-gaap_DerivativeLossOnDerivative
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration