Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Commodity derivatives	$ 1,091
Liabilities:
Commodity derivatives		$ 1,932
Warrant derivatives	5,410
Recurring basis [Member] | Level 1 [Member]
Assets:
Commodity derivatives
Liabilities:
Commodity derivatives
Warrant derivatives
Recurring basis [Member] | Level 2 [Member]
Assets:
Commodity derivatives	1,091
Liabilities:
Commodity derivatives		1,932
Warrant derivatives
Recurring basis [Member] | Level 3 [Member]
Assets:
Commodity derivatives
Liabilities:
Commodity derivatives
Warrant derivatives	$ 5,410