PROPERTIES AND EQUIPMENT Assets held-for-sale (Tables)

12 Months Ended

Dec. 31, 2017

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disclosure of Long Lived Assets Held-for-sale [Table Text Block]

The following table presents balance sheet data related to assets held-for-sale, which include the Utica Shale properties, field office facilities, and a parcel of land that are being marketed for sale. Assets held-for-sale represents the assets that are expected to be sold, net of liabilities that are expected to be assumed by the purchasers:    

	December 31, 2017		December 31, 2016
	(in thousands)
Assets
Properties and equipment, net	$	40,583	$	5,272
Total assets	$	40,583	$	5,272
Liabilities
Asset retirement obligation	$	499	$	—
Total liabilities	$	499	$	—
Net assets	$	40,084	$	5,272