Mortgage Loans on Real Estate (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Florida [Member]
Summary of mortgage Loans on Real Estate
Maturity date	Mar. 16, 2012
Iowa [Member]
Summary of mortgage Loans on Real Estate
Maturity date	Jan. 14, 2012
Mortgage Notes Receivables [Member]
Summary of mortgage Loans on Real Estate
Carrying Amount	97,381
Mortgage Notes Receivables [Member] | Permanent Mortgage Loans [Member] | Other Office Building [Member] | Iowa [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	7.70%
Maturity date	Jan. 10, 2014
Original Face Amount	40,000
Carrying Amount	40,000
Balloon	40,000
Mortgage Notes Receivables [Member] | Permanent Mortgage Loans [Member] | Medical Office [Member] | Florida [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	7.00%
Maturity date	Mar. 01, 2016
Original Face Amount	2,700
Carrying Amount	2,680
Balloon	2,562
Mortgage Notes Receivables [Member] | Permanent Mortgage Loans [Member] | Medical Office [Member] | Iowa [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	8.00%
Maturity date	Dec. 01, 2020
Original Face Amount	3,700
Carrying Amount	3,230
Balloon	3,230
Mortgage Notes Receivables [Member] | Construction Loans [Member] | Medical Office [Member] | Oklahoma [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	6.75%
Maturity date	Dec. 31, 2013
Original Face Amount	91,179
Carrying Amount	19,896
Balloon	19,896
Mortgage Notes Receivables [Member] | Construction Loans [Member] | Medical Office [Member] | Iowa [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	11.00%
Maturity date	Mar. 31, 2012
Original Face Amount	2,136
Carrying Amount	1,469
Balloon	1,469
Mortgage Notes Receivables [Member] | Construction Loans [Member] | Medical Office [Member] | Texas [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	8.10%
Maturity date	May 01, 2012
Original Face Amount	12,444
Carrying Amount	9,547
Balloon	9,547
Mortgage Notes Receivables [Member] | Construction Loans [Member] | Orthopedic Surgical Facility [Member] | Missouri [Member]
Summary of mortgage Loans on Real Estate
Interest Rate	6.75%
Maturity date	Dec. 31, 2013
Original Face Amount	111,400
Carrying Amount	20,559
Balloon	20,559