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Fair Value Measurements (Details 3) (USD $)
Sep. 30, 2013
Sep. 30, 2013
Carrying Amount
Sep. 30, 2013
Fair Value
Sep. 30, 2013
Recurring basis
Carrying Amount
Interest rates swaps
Sep. 30, 2013
Recurring basis
Fair Value
Interest rates swaps
Dec. 31, 2012
Ziegler Healthcare Real Estate Funds
Dec. 31, 2011
Ziegler Healthcare Real Estate Funds
Dec. 31, 2012
Ziegler Healthcare Real Estate Funds
Carrying Amount
Dec. 31, 2011
Ziegler Healthcare Real Estate Funds
Carrying Amount
Dec. 31, 2012
Ziegler Healthcare Real Estate Funds
Fair Value
Dec. 31, 2011
Ziegler Healthcare Real Estate Funds
Fair Value
Dec. 31, 2012
Ziegler Healthcare Real Estate Funds
Recurring basis
Carrying Amount
Interest rates swaps
Dec. 31, 2011
Ziegler Healthcare Real Estate Funds
Recurring basis
Carrying Amount
Interest rates swaps
Dec. 31, 2012
Ziegler Healthcare Real Estate Funds
Recurring basis
Fair Value
Interest rates swaps
Dec. 31, 2011
Ziegler Healthcare Real Estate Funds
Recurring basis
Fair Value
Interest rates swaps
Fair value of other financial instruments                              
Cash   $ 4,233,000 $ 4,233,000         $ 2,614,000   $ 2,614,000          
Debt   46,675,000 47,192,000         84,489,000 98,674,263 86,982,000 91,120,934        
Derivative liabilities $ 437,000     $ 437,000 $ 437,000 $ 643,000 $ 764,994         $ 643,000 $ 764,994 $ 643,000 $ 764,994