General Business (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
DD&A	$ 7,942	$ 10,648	$ 26,180	$ 32,756
Savoy [Member]
Equity method investment ownership percentage	40.00%		40.00%
Sunrise Energy [Member]
Equity method investment ownership percentage	50.00%		50.00%
Change From The Straight-Line Method To The Units-Of-Production Method [Member]
DD&A	$ (3,100)		$ (6,600)