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Transactions with Related Party (Details) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2005
SHG
person
Mar. 31, 2012
SHG
person
Mar. 31, 2011
SHG
Dec. 31, 2011
SHG
Feb. 28, 2006
Laurel
Y
Mar. 31, 2012
Laurel
Mar. 31, 2011
Laurel
Dec. 31, 2011
Laurel
Transactions with Related Party                      
Number of directors serving as chief executive officer of related entity       1 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   6,500,000   6,500,000        
Interest income related to senior subordinated notes 180,000 180,000     180,000 180,000          
Period of master lease agreement (in years)               15      
Rental income 1,086,000 1,059,000             1,086,000 1,059,000  
Straight-line rental income 39,000 66,000             39,000 66,000  
Straight-line rental income receivable from subsidiaries $ 3,099,000   $ 3,060,000           $ 3,099,000   $ 3,060,000