Commitments and Contingencies Ohio Ownership (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Oct. 31, 2011 entities	Dec. 31, 2011 Consolidated Properties Subject to Sale [Member] limited	Sep. 30, 2012 Boston Capital Limited Partners [Member] limited	Dec. 31, 2011 Boston Capital Limited Partners [Member] limited
Limited Partners		2	3	2	2
Limited Partner Contribution promise		$ 6.7	$ 6.7
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant