Interest Rate Derivative Agreements (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)
Bank of New York Mellon [Member]
Derivative [Line Items]
Derivative, Purchase Date	2010-09
Derivative Asset, Initial Notional Amount	$ 31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2017-09
Derivative at purchase price	$ 921,000
Derivative, Variable Debt Financing Facility Hedged	M24 TEBS
Derivative, Maximum Potential Cost of Borrowing	5.00%
Barclays Bank PLC [Member]
Derivative [Line Items]
Derivative, Purchase Date	2010-09
Derivative Asset, Initial Notional Amount	$ 31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2017-09
Derivative at purchase price	$ 845,600
Derivative, Variable Debt Financing Facility Hedged	M24 TEBS
Derivative, Maximum Potential Cost of Borrowing	5.00%
Royal Bank of Canada [Member]
Derivative [Line Items]
Derivative, Purchase Date	2010-09
Derivative Asset, Initial Notional Amount	$ 31,936,667
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2017-09
Derivative at purchase price	$ 928,000
Derivative, Variable Debt Financing Facility Hedged	M24 TEBS
Derivative, Maximum Potential Cost of Borrowing	5.00%
Deutsche Bank [Member]
Derivative [Line Items]
Derivative, Purchase Date	2013-08
Derivative Asset, Initial Notional Amount	$ 93,305,000
Derivative, Fixed Interest Rate	1.50%
Derivative, Maturity Date at a point in time	2017-09
Derivative at purchase price	$ 793,000
Derivative fair value	$ 669	[1]
Derivative, Variable Debt Financing Facility Hedged	M24 TEBS
Derivative, Maximum Potential Cost of Borrowing	3.50%
SMBC Capital Markets, Inc [Member]
Derivative [Line Items]
Derivative, Purchase Date	2014-02
Derivative Asset, Initial Notional Amount	$ 41,250,000
Derivative, Fixed Interest Rate	1.00%
Derivative, Maturity Date at a point in time	2017-03
Derivative at purchase price	$ 230,500
Derivative fair value	$ 78	[1]
Derivative, Variable Debt Financing Facility Hedged	PHC TOB Trusts
Derivative, Maximum Potential Cost of Borrowing	3.30%
Barclays Bank PLC 2 [Member]
Derivative [Line Items]
Derivative, Purchase Date	2014-07
Derivative Asset, Initial Notional Amount	$ 31,565,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2019-08
Derivative at purchase price	$ 315,200
Derivative fair value	$ 936	[1]
Derivative, Variable Debt Financing Facility Hedged	M31 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.40%
Royal Bank of Canada-2 [Member]
Derivative [Line Items]
Derivative, Purchase Date	2014-07
Derivative Asset, Initial Notional Amount	$ 31,565,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2019-08
Derivative at purchase price	$ 343,000
Derivative fair value	$ 936	[1]
Derivative, Variable Debt Financing Facility Hedged	M31 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.40%
SMBC Capital Markets, Inc-3 [Member]
Derivative [Line Items]
Derivative, Purchase Date	2014-07
Derivative Asset, Initial Notional Amount	$ 31,565,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2019-08
Derivative at purchase price	$ 333,200
Derivative fair value	$ 936	[1]
Derivative, Variable Debt Financing Facility Hedged	M31 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.40%
Wells Fargo Bank [Member]
Derivative [Line Items]
Derivative, Purchase Date	2015-07
Derivative Asset, Initial Notional Amount	$ 28,095,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2020-08
Derivative at purchase price	$ 210,000
Derivative fair value	$ 9,603	[1]
Derivative, Variable Debt Financing Facility Hedged	M33 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.30%
Royal Bank of Canada-3 [Member]
Derivative [Line Items]
Derivative, Purchase Date	2015-07
Derivative Asset, Initial Notional Amount	$ 28,095,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2020-08
Derivative at purchase price	$ 187,688
Derivative fair value	$ 9,603	[1]
Derivative, Variable Debt Financing Facility Hedged	M33 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.30%
SMBC Capital Markets, Inc-4 [Member]
Derivative [Line Items]
Derivative, Purchase Date	2015-07
Derivative Asset, Initial Notional Amount	$ 28,095,000
Derivative, Fixed Interest Rate	3.00%
Derivative, Maturity Date at a point in time	2020-08
Derivative at purchase price	$ 174,900
Derivative fair value	$ 9,603	[1]
Derivative, Variable Debt Financing Facility Hedged	M33 TEBS
Derivative, Maximum Potential Cost of Borrowing	4.30%

[1] For additional details, see Note 20 to the Partnership's consolidated financial statements.