Annual report pursuant to Section 13 and 15(d)

Income Taxes - Domestic and foreign income taxes (Details)

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Income Taxes - Domestic and foreign income taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Domestic $ 7,704,867 $ 29,400,084 $ 43,255,574
Foreign (4,945,999) (4,793,198) 924,531
Income before provision for income taxes $ 2,758,868 $ 24,606,886 $ 44,180,105