Finite Lived Intangible Asset and Liability Schedule of Estimated Future Amortization Expense (Details)	Jun. 30, 2017 USD ($)
Power Purchase Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
2017 (remainder)	$ 1,543,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,031,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,031,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,049,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,031,000
Thereafter	16,930,000
Industrial revenue bond tax savings [Member]
Finite-Lived Intangible Assets [Line Items]
2017 (remainder)	193
Finite-Lived Intangible Assets, Amortization Expense, Year Two	513
Finite-Lived Intangible Assets, Amortization Expense, Year Three	513
Finite-Lived Intangible Assets, Amortization Expense, Year Four	513
Finite-Lived Intangible Assets, Amortization Expense, Year Five	513
Thereafter	10,379
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
2017 (remainder)	305,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	605,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	605,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	605,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	605,000
Thereafter	$ 11,724,000