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Marketable Securities (Details) (SHG, USD $)
1 Months Ended 6 Months Ended
Dec. 31, 2005
person
Jun. 30, 2012
person
Dec. 31, 2011
SHG
     
Marketable Securities      
Investment in senior subordinated notes of related party     $ 6,500,000
Face rate of senior subordinated notes (as a percent)   11.00%  
Effective yield on senior subordinated notes (as a percent)   11.10%  
Number of directors serving as chief executive officer of related entity 1 1