General Business (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
DD&A	$ 9,056	$ 10,770	$ 18,238	$ 22,108
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			$ (3,500)