Real Estate Mortgages Receivable (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
Jun. 30, 2012	Apr. 30, 2012	Sep. 30, 2012
Real Estate Mortgages Receivable
Mortgage financing related to office property sold	$ 1,000	$ 419
Interest rate on real estate mortgage receivable (as a percent)	5.00%	6.00%
Real estate mortgage receivable included in other assets, carrying value			$ 1,419

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

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