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Transactions with Related Party (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2005
SHG
Dec. 31, 2012
SHG
person
Dec. 31, 2011
SHG
Dec. 31, 2010
SHG
Feb. 28, 2006
Laurel
Dec. 31, 2012
Laurel
Dec. 31, 2011
Laurel
Dec. 31, 2010
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 235,000 721,000 720,000   235,000 721,000 720,000        
Period of master lease agreement               15 years      
Rental income 4,370,000 4,264,000 4,160,000           4,370,000 4,264,000 4,160,000
Straight-line rental income 131,000 238,000 342,000           131,000 238,000 342,000
Straight-line rental income receivable from subsidiaries $ 3,191,000 $ 3,060,000             $ 3,191,000 $ 3,060,000