Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		12 Months Ended		0 Months Ended		1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended
	Jul. 11, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2006	Jul. 11, 2012 Farmington Hills Claim [Member]	Apr. 28, 2012 Farmington Hills Claim [Member]	Jun. 30, 2006 Farmington Hills Claim [Member]	Dec. 31, 2012 Farmington Hills Claim [Member]	Oct. 12, 2007 Farmington Hills Claim [Member]	Apr. 28, 2012 Antioch Claim [Member]	Jun. 30, 2006 Antioch Claim [Member]	Oct. 12, 2007 Antioch Claim [Member]	Dec. 31, 2012 Base Building Improvements [Member]	Dec. 31, 2012 Tenant Improvement Allowance [Member]
Commitments and Contingencies [Line Items]
Other Commitment														$ 8,414	$ 5,567
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%
Loss Contingency, Settlement Agreement, Damages Not Including Interest and Expenses						826					388
Loss Contingency, Settlement Agreement, Interest Rate Per Annum						10.00%					10.00%
Loss Contingency, Settlement Agreement, Damages, Prejudgement Interest							482				226
Loss Contingency, Settlement Agreement, Statutory Interest Rate Per Annum							9.00%				9.00%
Litigation Settlement, Expense	827
Loss Contingency Accrual, Carrying Value, Provision		2,775	2,800
Bankruptcy claims amount of claims settled										6,500			7,200
Formal claim demand									826
Claimed damages not including interest and expenses									1,200
Lease termination payment				$ 19,910