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Transactions with Related Party (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2005
SHG
Jun. 30, 2012
SHG
Jun. 30, 2012
SHG
Dec. 31, 2007
SHG
Feb. 28, 2006
Laurel
Jun. 30, 2013
Laurel
Jun. 30, 2012
Laurel
Jun. 30, 2013
Laurel
Jun. 30, 2012
Laurel
Dec. 31, 2012
Laurel
Transactions with Related Party                              
Senior subordinated notes purchased in open market           $ 10,000,000                  
Face rate of senior subordinated notes (as a percent)           11.00%                  
Effective yield on senior subordinated notes (as a percent)           11.10%                  
Remaining investment in senior subordinated notes of related party                 6,500,000            
Interest income related to senior subordinated notes   55,000   235,000     55,000 235,000              
Period of master lease agreement                   15 years          
Rental income 1,122,000 1,095,000 2,235,000 2,181,000             1,122,000 1,095,000 2,235,000 2,181,000  
Straight-line rental income 3,000 31,000 16,000 70,000             3,000 31,000 16,000 70,000  
Straight-line rent receivable $ 3,206,000   $ 3,206,000   $ 3,191,000           $ 3,206,000   $ 3,206,000   $ 3,191,000