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Marketable Securities (Details) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2005
SHG
person
Dec. 31, 2011
SHG
person
Dec. 31, 2010
SHG
Marketable Securities            
Investment in senior subordinated notes of related party $ 6,500,000 $ 6,500,000 $ 6,500,000   $ 6,500,000 $ 6,500,000
Face rate of senior subordinated notes (as a percent)       11.00% 11.00%  
Effective yield on senior subordinated notes (as a percent)       11.10% 11.10%  
Number of directors serving as chief executive officer of related entity       1 1