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Transactions with Related Party (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2005
SHG
Sep. 30, 2011
SHG
Sep. 30, 2012
SHG
person
Sep. 30, 2011
SHG
Dec. 31, 2011
SHG
Feb. 28, 2006
Laurel
Sep. 30, 2012
Laurel
Sep. 30, 2011
Laurel
Sep. 30, 2012
Laurel
Sep. 30, 2011
Laurel
Dec. 31, 2011
Laurel
Transactions with Related Party                                
Number of directors serving as chief executive officer of related entity               1                
Senior subordinated notes purchased in open market           $ 10,000,000                    
Face rate of senior subordinated notes (as a percent)           11.00%   11.00%   11.00%            
Effective yield on senior subordinated notes (as a percent)           11.10%   11.10%   11.10%            
Investment in senior subordinated notes of related party         6,500,000         6,500,000            
Interest income related to senior subordinated notes   180,000 235,000 540,000     180,000 235,000 540,000              
Period of master lease agreement                     15 years          
Rental income 1,095,000 1,068,000 3,275,000 3,196,000               1,095,000 1,068,000 3,275,000 3,196,000  
Straight-line rental income 31,000 57,000 101,000 181,000               31,000 57,000 101,000 181,000  
Straight-line rental income receivable from subsidiaries $ 3,160,000   $ 3,160,000   $ 3,060,000             $ 3,160,000   $ 3,160,000   $ 3,060,000