Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies (Operating Leases) (Details)

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Commitments and contingencies (Operating Leases) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Rental Expense        
2015 $ 2,910,632   $ 2,910,632  
2016 8,262,502   8,262,502  
2017 8,183,697   8,183,697  
2018 8,306,805   8,306,805  
2019 8,434,651   8,434,651  
Thereafter 111,094,547   111,094,547  
Total 147,192,834   147,192,834  
Rental Income        
2015 (879,538)   (879,538)  
2016 (1,279,269)   (1,279,269)  
2017 (1,059,545)   (1,059,545)  
2018 (1,079,640)   (1,079,640)  
2019 (1,116,229)   (1,116,229)  
Thereafter (3,084,946)   (3,084,946)  
Total (8,499,167)   (8,499,167)  
Net Amount        
2015 2,031,094   2,031,094  
2016 6,983,233   6,983,233  
2017 7,124,152   7,124,152  
2018 7,227,165   7,227,165  
2019 7,318,422   7,318,422  
Thereafter 108,009,601   108,009,601  
Total 138,693,667   138,693,667  
Percentage rent 88,058 $ 119,531 167,776 $ 227,609
Rent expense 1,677,646 1,056,646 2,529,165 2,023,302
Rental income related to subleases $ 205,417 $ 216,726 $ 388,498 $ 411,619