Disclosures About Capitalized Costs, Costs Incurred (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Company
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Development costs—other	$ 0	$ 0	$ 102
Total	0	0	102
Company's Share of Laramie Energy
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Development costs—other	12,805	21,747	15,599
Acquisition costs	65,324	0	0
Total	$ 78,129	$ 21,747	$ 15,599