SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Costs Incurred in Natural Gas and Crude Oil Property Acquisition, Exploration and Development Activities (Unadited) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Proved Properties	[1],[2]	$ 268,567	$ 3,561	$ 11,973
Unproved Properties	[2]	1,843,985	15	45,999
Development Costs	[3]	383,336	552,104	608,176
Exploratory drilling	[4]	0	0	0
Geological and geophysical	[4]	4,669	0	1
Total Costs Incurred		2,500,557	555,680	666,149
Cost Incurred to Convert PUDs to PDNP		$ 204,600	$ 207,800	$ 125,200

[1] Includes approximately $40.9 million of infrastructure and pipeline costs in 2016.

[2] Property acquisition costs represent costs incurred to purchase, lease or otherwise acquire a property.

[3] Development costs represent costs incurred to gain access to and prepare development well locations for drilling, drill and equip development wells, recomplete wells, and provide facilities to extract, treat, gather, and store crude oil, natural gas, and NGLs. Of these costs incurred for the years ended December 31, 2016, 2015, and 2014, $204.6 million, $207.8 million, and $125.2 million, respectively, were incurred to convert proved undeveloped reserves to proved developed reserves from the prior year end

[4] Exploration costs - represents costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing crude oil, natural gas, and NGLs