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Marketable Securities (Details) (SHG, USD $)
12 Months Ended
Dec. 31, 2013
person
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