Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Other Securities Fair Value of Other Securities (Details 4)

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Fair Value of Other Securities Fair Value of Other Securities (Details 4) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]      
Revenues $ 10,047,557 $ 8,153,817  
EBITDA 3,009,786 3,818,231  
Other Income (expenses) 472,261 2,017,792  
Net income 2,105,159 2,412,753  
Assets      
Total Assets 331,595,675   283,875,659
Liabilities      
Total Liabilities 81,010,818   78,334,289
Reported Value Measurement [Member]
      
Assets      
Total Assets 603,425,197   603,598,511
Liabilities      
Total Liabilities 216,723,869   214,499,756
Reported Value Measurement [Member] | Unconsolidated Affiliates [Member]
      
Schedule of Equity Method Investments [Line Items]      
Revenues 31,222,000 27,108,000  
Operating Expenses 26,940,000 21,282,000  
EBITDA 4,282,000 5,826,000  
Other Income (expenses) (1,131,000) 8,237,000  
Net income 3,151,000 14,063,000  
Assets      
Current assets 48,678,805   49,195,626
Noncurrent assets 554,746,392   554,402,885
Liabilities      
Current liabilities 31,221,244   31,860,653
Noncurrent liabilities 185,502,625   182,639,103
Partners' Equity      
Partners' Equity 386,701,328   389,098,755
Total Partners' Equity 386,701,328   389,098,755
Total liabilities and partner's equity $ 603,425,197   $ 603,598,511