Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Balance Sheet of Unconsolidated Affiliate (Details)

v3.7.0.1
Fair Value - Balance Sheet of Unconsolidated Affiliate (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Assets    
Total Assets $ 670,730,109 $ 650,732,571
Liabilities    
Total Liabilities 169,357,813 216,823,091
Lightfoot [Member] | Reported Value Measurement [Member] | Unconsolidated Affiliates [Member]    
Assets    
Current assets 17,787 20,412
Noncurrent assets 693,156 698,745
Total Assets 710,943 719,157
Liabilities    
Current liabilities 14,902 14,718
Noncurrent liabilities 271,320 268,805
Total Liabilities 286,222 283,523
Partner's equity 424,721 435,634
Total liabilities and partner's equity $ 710,943 $ 719,157