PROPERTY, PLANT AND EQUIPMENT:



	March 31, 2018		December 31, 2017
Property, Plant and Equipment
Intangible drilling cost	$	3,902,099	$	3,849,689
Proved gas properties	975,256		1,999,891
Gas gathering equipment	2,146,869		1,182,234
Unproved gas properties	929,875		919,733
Gas wells and related equipment	772,542		834,120
Surface land and other equipment	310,460		309,602
Other gas assets	66,250		221,226
Total Property, Plant and Equipment	$	9,103,351	$	9,316,495
Less: Accumulated Depreciation, Depletion and Amortization	2,481,535		3,526,742
Total Property, Plant and Equipment - Net	$	6,621,816	$	5,789,753

Property, Plant and Equipment Impairment

In February 2017, the Company approved a plan to sell subsidiaries Knox Energy LLC and Coalfield Pipeline Company (collectively, Knox). Knox met all of the criteria to be classified as held for sale in February 2017. The potential disposal of Knox did not represent a strategic shift that would have a major effect on the Company's operations and financial results and was, therefore, not classified as discontinued operations in accordance with ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360). As part of the required evaluation under the held for sale guidance, the asset's book value was evaluated and adjusted to the lower of its carrying amount or fair value less cost to sell. The Company determined that the approximate fair value less costs to sell Knox was less than the carrying value of the net assets which resulted in an impairment of $137,865 in February 2017, included in Impairment of Exploration and Production Properties within the Consolidated Statements of Income. The sale of Knox closed in the second quarter of 2017.

Industry Participation Agreements

CNX is party to an industry participation agreement (referred to as a "joint venture" or "JV") that provided drilling and completion carries for the Company's retained interests. This joint development agreement is with Hess Ohio Developments, LLC (Hess) with respect to approximately 125 thousand net Utica Shale acres in Ohio in which each party has a 50% undivided interest. Under the agreement, as amended, Hess was obligated to pay a total of approximately $335,000 in the form of a 50% drilling carry of certain CNX working interest obligations as the acreage is developed. As of December 31, 2016, Hess' entire carry obligation has been satisfied.