Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Balance Sheet of Unconsolidated Affiliate (Details)

v3.8.0.1
Fair Value - Balance Sheet of Unconsolidated Affiliate (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Assets    
Total Assets $ 647,939,143 $ 650,732,571
Liabilities    
Total Liabilities 148,684,319 216,823,091
Lightfoot [Member] | Reported Value Measurement [Member] | Unconsolidated Affiliates [Member]    
Assets    
Current assets 20,789 20,412
Noncurrent assets 691,340 698,341
Total Assets 712,129 718,753
Liabilities    
Current liabilities 18,950 14,530
Noncurrent liabilities 275,272 268,805
Total Liabilities 294,222 283,335
Partner's equity 417,907 435,418
Total liabilities and partner's equity $ 712,129 $ 718,753