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Marketable Securities (Details) (SHG, USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
person
Sep. 30, 2012
Dec. 31, 2012
SHG
     
Marketable Securities      
Face rate of senior subordinated notes (as a percent)     11.00%
Effective yield on senior subordinated notes (as a percent)     11.10%
Interest income recognized from investment   $ 235,000  
Investment in senior subordinated notes of related party   $ 6,500,000  
Number of directors serving as chief executive officer of related entity 1