Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended				1 Months Ended	6 Months Ended		1 Months Ended		0 Months Ended
	Oct. 31, 2011	Jun. 30, 2006	Jul. 11, 2012 Settlement of Litigation [Member]	Jun. 30, 2012 Settlement of Litigation [Member]	Jun. 30, 2006 Farmington Hills Claim [Member]	Jun. 30, 2012 Farmington Hills Claim [Member]	Oct. 12, 2007 Farmington Hills Claim [Member]	Jun. 30, 2006 Antioch Claim [Member]	Oct. 12, 2007 Antioch Claim [Member]	Jul. 11, 2012 Attorney's Fees and Disbursements [Member] Settlement of Litigation [Member]	Jul. 11, 2012 Antioch Claim [Member] Settlement of Litigation [Member]	Jul. 11, 2012 Antioch Claim [Member] Prejudgemment Interest [Member] Settlement of Litigation [Member]	Jul. 11, 2012 Farmington Hills Claim [Member] Settlement of Litigation [Member]	Jul. 11, 2012 Farmington Hills Claim [Member] Prejudgemment Interest [Member] Settlement of Litigation [Member]	Jun. 30, 2012 Base Building Improvements [Member]	Jun. 30, 2012 Tenant Improvement [Member]
Commitments and Contingencies [Line Items]
Other Commitment															$ 12,800	$ 10,300
Bankruptcy Claims, Amount of Claims Filed					7,680			7,727
Bankruptcy Claims Sold For Amount					5,376			5,680
Guarantee Obligation Penalty Interest Rate Per Annum		10.00%
Bankruptcy Claims, Amount of Claims Settled							6,500		7,200
Formal Claim Demand						826
Claimed Damages Not Including Interest and Expenses						1,200
Loss Contingency, Damages Awarded, Value											388		826
Loss Contingency, Damages Awarded, Interest Percentage										9.00%	9.00%	10.00%	10.00%	9.00%
Loss Contingency, Damages Awarded, Interest Amount										827		226		482
Loss Contingency Accrual, at Carrying Value				2,800
Loss Contingency, Settlement Agreement, Consideration			2,775
Lease Termination Payment	$ 19,910