Mortage Notes Receivable (Schedule of Mortgage Loans on Real Estate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Mortgage notes receivable, net	$ 78,672	$ 75,465
Final Payment Date 2011 [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of interest at 14.5%; principal due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	1,000
Mortgage notes receivable, net		1,000
Final Payment Date 2012 A [Member]
Mortgage Loans on Real Estate, Number of Loans	7
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payments of $9 to $69, which include interest at 6.9%
Mortgage Loans on Real Estate, Face Amount of Mortgages	40,526
Mortgage notes receivable, net	16,604	19,049
Final Payment Date 2012 B [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of $120, including interest at 9.0%(1) Balloon payment due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	12,162
Mortgage notes receivable, net	5,197	5,732
Final Payment Date 2013 [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of $29, including interest at 6.5%(1)(2) Balloon payment due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	5,506
Mortgage notes receivable, net	1,274	649
Final Payment Date 2014 A [Member]
Mortgage Loans on Real Estate, Number of Loans	8
Mortgage Loans on Real Estate, Periodic Payment Terms	Note A: $11.6 million with monthly payments of interest at 8.5% with principal due at maturity; Note B: $9.7 million with principal and interest at 3.0% due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	26,293
Mortgage notes receivable, net	21,337	21,322
Final Payment Date 2014 B [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payments of interest at a variable rate, current rate is 12.0% (next adjustment in October 2012 with principal due at maturity; additional $50,000 to be drawn during 2012)
Mortgage Loans on Real Estate, Face Amount of Mortgages	850
Mortgage notes receivable, net	800	800
Final Payment Date 2014 C [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of interest at 13.0%; principal due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	2,500
Mortgage notes receivable, net	2,500
Final Payment Date 2015 A [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of interest at 14.0%; principal due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	1,000
Mortgage notes receivable, net	1,000	1,000
Final Payment Date 2015 B [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Interest accrues at 10.0% during construction; monthly payment of interest only; principal due at maturity
Mortgage Loans on Real Estate, Face Amount of Mortgages	13,870
Mortgage notes receivable, net	11,870	7,520
Final Payment Date 2018 [Member]
Mortgage Loans on Real Estate, Number of Loans	1
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payment of $38, including interest at 7.47%
Mortgage Loans on Real Estate, Face Amount of Mortgages	5,033
Mortgage notes receivable, net	3,809	3,850
Final Payment Dates 2027-2032 [Member]
Mortgage Loans on Real Estate, Number of Loans	6
Mortgage Loans on Real Estate, Periodic Payment Terms	Monthly payments of $19 to $32, which include interest ranging from 8.0 to 9.6%
Mortgage Loans on Real Estate, Face Amount of Mortgages	20,774
Mortgage notes receivable, net	$ 14,281	$ 14,543